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Old 10-10-2020, 08:13 AM   #1
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Maximum Realistic Pin Weight 3/4 Duramax

I am thinking about moving up to a 5th wheel in the next year or so and trying to be realistic about my safe upper pin weight limits. I have a 2018 Duramax 3/4 Ton Short Bed. Based on what I have learned, I should have gone with a 1 ton SRW. Looks like this is a common experience.

My maximum truck weight or GVWR is 10,000. The stated Curb Weight is 7,462 which if I understand this correctly leaves me with 2,513 lbs for Pin Wt and any other loads such as people and gear. I anticipate using an Anderson Ultimate which I think is about 75 lbs. The B&W Gooseneck for my truck will add about 105 lbs. That seems to give me a remaining 2,320 lb carrying capacity.

I am interested in hearing the groups wisdom about what my realistic limits are for pin weight?? Seems like many end up going over either by choice or by accident and the truck handles it fairly well but I do want to be safe with my final configuration.
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Old 10-10-2020, 08:40 AM   #2
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I agree, many F250/2500 owners go over GVWR with no problems. AFAIK, keeping at or below the 10,000lb rating has more to do with drivers licensing, taxes, fees and commercial trucking scale stop requirements.
Just remember you are going over GVWR at your own risk. How far you can go over boils down to common sense and seat of your pants assumptions..
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Old 10-10-2020, 08:52 AM   #3
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My opinion is that the 3/4 ton rating has more to do with dmv than engineering.

That said I would add Timbren overloads. They added softer springs. The tv needs to be level. Stay under the rear axle Published limit.

Try to find a fifth wheel with under #2000 advertised pin weight.

Buy a 1 ton next.
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Old 10-10-2020, 09:01 AM   #4
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I appreciate the input. Good idea about the Timbren overloads. I wondered too if anyone upgraded the rear springs at an axle shop? That is usually a relatively low cost job.
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Old 10-10-2020, 09:16 AM   #5
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I am thinking about moving up to a 5th wheel in the next year or so and trying to be realistic about my safe upper pin weight limits. I have a 2018 Duramax 3/4 Ton Short Bed. Based on what I have learned, I should have gone with a 1 ton SRW. Looks like this is a common experience.

My maximum truck weight or GVWR is 10,000. The stated Curb Weight is 7,462 which if I understand this correctly leaves me with 2,513 lbs for Pin Wt and any other loads such as people and gear. I anticipate using an Anderson Ultimate which I think is about 75 lbs. The B&W Gooseneck for my truck will add about 105 lbs. That seems to give me a remaining 2,320 lb carrying capacity.

I am interested in hearing the groups wisdom about what my realistic limits are for pin weight?? Seems like many end up going over either by choice or by accident and the truck handles it fairly well but I do want to be safe with my final configuration.
If you want to REALLY know you’ll need to research frame, axle and spring specs of your 3/4 ton and compare them to the SRW one ton. I did this for a 2015 F250 and found that it was 100% identical to the SRW because I had the camper package installed. If it hadn’t had that, the difference would have only been an overload spring and the height of the spacer block on the rear axle. It won’t change the sticker, but you could always peel that off if it makes you feel better
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Old 10-10-2020, 09:22 AM   #6
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If you upgrade the springs it rides a little rougher.

The Timbrens do nothing until the load is added. You can install them in an hour easy. I am 70 and pretty arthritic.

We love the aluminum Anderson ultimate hitch. My kid installed the B&W ball. Easy 2-3 hour job in our Ram. The ball adapter and Anderson hitch weigh less than #100.
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Old 10-10-2020, 10:40 AM   #7
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If you upgrade the springs it rides a little rougher.

The Timbrens do nothing until the load is added. You can install them in an hour easy. I am 70 and pretty arthritic.

We love the aluminum Anderson ultimate hitch. My kid installed the B&W ball. Easy 2-3 hour job in our Ram. The ball adapter and Anderson hitch weigh less than #100.

Thanks tomKatb. Good point about the stiff ride if I went with helper springs.
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Old 10-10-2020, 10:51 AM   #8
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Do you really want to compromise the trailer when your truck will be ready for a trade soon? Just a thought .....
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Old 10-10-2020, 11:05 AM   #9
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i have a 2018 chev. duramax LTZ. i use a Anderson ranch hitch on trailer. Kurt turnover ball chev. installed at factory. Ride is smooth but not perfect. pulling a 30 ft puma toyhauler, can am spyder in box, and a 17.5 ft. Mybayliner in tow. no extra springs, doesnt sag rear of truck. power is there, fuel mileage is good. 10+ loaded to the max. i dont do the pin weight stuff ,tow stuff weight i just go do my camping. I have been all over the lower usa never a problem . Police "0" bothering us. help us yes, said good buy. . My neighbor has 1 ton chev, same set up 40ft 5th wheel, 2razors on a trailer and harley in box. no problems either.
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Old 10-10-2020, 02:28 PM   #10
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I have the 2015 GMC Duramax 2500HD 6.6ft std. bed with Andersen Ultimate. My 5er is an Ultralight which Forest River advertises as a little less than 1600# pin weight. Using the trucks stickers my available payload is just about what you are calculating BUT..things add up quickly.

Last CAT weigh, I'm about 100# over the available rated payload. Some of the add came from the side steps I added. I changed the std pinbox 1621 to a MorRyde RPB (better ride, just a few pounds more). I carry a 3500 Inverter in the truck bed also. I have a Portaboat collapsed and carried under the front of the 5er.

We've been traveling with this setup for 5 years and everytime I clear out clothes and stuff weight, it just seems to crawl back in ;-)

Last comment, is that I added air bags simply to be able to level out the headlights when or if I decide to travel at night (didn't add any capability, the just help level). My setup travels well and if I ever trade trucks or trailers, I'm hoping to duplicate what I have.
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Old 10-10-2020, 03:05 PM   #11
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I researched the difference between 3/4 and 1 ton. For you with the diesel you have the upgraded rear vs my gas rear. Axel are the same brakes are the same. Think the front sway bar is different and 1 extra leaf. Thats it, everything else is the same.
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Old 10-10-2020, 05:12 PM   #12
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Quote:
Originally Posted by hbillsmith View Post
I have the 2015 GMC Duramax 2500HD 6.6ft std. bed with Andersen Ultimate. My 5er is an Ultralight which Forest River advertises as a little less than 1600# pin weight. Using the trucks stickers my available payload is just about what you are calculating BUT..things add up quickly.

Last CAT weigh, I'm about 100# over the available rated payload. Some of the add came from the side steps I added. I changed the std pinbox 1621 to a MorRyde RPB (better ride, just a few pounds more). I carry a 3500 Inverter in the truck bed also. I have a Portaboat collapsed and carried under the front of the 5er.

We've been traveling with this setup for 5 years and everytime I clear out clothes and stuff weight, it just seems to crawl back in ;-)

Last comment, is that I added air bags simply to be able to level out the headlights when or if I decide to travel at night (didn't add any capability, the just help level). My setup travels well and if I ever trade trucks or trailers, I'm hoping to duplicate what I have.

This is helpful to have your actual weights. I am currently also carrying a 3500 watt in my truck bed but I thought perhaps I could move that to rear hitch mount off the 5th wheel.
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Old 10-10-2020, 05:15 PM   #13
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Originally Posted by cmysstailights View Post
I researched the difference between 3/4 and 1 ton. For you with the diesel you have the upgraded rear vs my gas rear. Axel are the same brakes are the same. Think the front sway bar is different and 1 extra leaf. Thats it, everything else is the same.

Thanks for this information. I had seen this somewhere else that the actual differences between a 3/4 and 1 ton Duramax were minimal. The door pillar sticker of course would still have the 3/4 ton limits.
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Old 10-10-2020, 06:42 PM   #14
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Not a single one of these "everything else is the same" posts mentions the tires. Every 3/4 ton truck sitting on the lot at the time I checked them had tires that were each rated to exactly half of the rear axle weight rating. This was also true of the 1 ton SRW trucks with their higher rear axle rating (they had higher rated tires than the 3/4 ton). In other words, the tires were the limiting factor, or at least equal to it. CHECK YOUR TIRES if you are planning to run at, or over, your 3/4 ton trucks weight rating.
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Old 10-10-2020, 06:56 PM   #15
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Do you really want to compromise the trailer when your truck will be ready for a trade soon? Just a thought .....
Why would the truck “be ready to trade soon”?
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Old 10-10-2020, 07:02 PM   #16
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Not a single one of these "everything else is the same" posts mentions the tires. Every 3/4 ton truck sitting on the lot at the time I checked them had tires that were each rated to exactly half of the rear axle weight rating. This was also true of the 1 ton SRW trucks with their higher rear axle rating (they had higher rated tires than the 3/4 ton). In other words, the tires were the limiting factor, or at least equal to it. CHECK YOUR TIRES if you are planning to run at, or over, your 3/4 ton trucks weight rating.

I am still learning but I did check for tire differences between a SRW Duramax 3500 and a standard Duramax 2500 and both had identical tire recommendations on the Tire Rack website. I was looking at 265 70R 18 tire. Both vehicles were calling for E rated tires with a load capacity of 3,525 lbs. I will definitely keep this in mind if I decide to move on into a 5th wheel. I am also not planning on pushing my luck with pin weight so hopefully, this is not an significant limitation.
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Old 10-10-2020, 09:04 PM   #17
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We have a 2018 gmc 2500hd duramax and tow a Cedar Creek 36ck2 with a pin weight of 2700lb, trailer is about 14,500lb. We added airbags with onboard air compressor. Talking to a GM executive on trucks and he told me there is NO DIFFERENCE between a 2500 and a 3500 except for 1 overload spring. I saw a twin to my truck with the exception 0f it being a 3500 srw and looked at his door sticker, it said 3200lb load. So no problem we did up grade tires from a 285x60 x20 to a 285x65x20 and that got me a 3850lb load per tire, so no problem. We have pulled it with our Andersen hitch for more than 18,000 miles over 2.5 years.
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Old 10-10-2020, 09:55 PM   #18
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We have a 2018 gmc 2500hd duramax and tow a Cedar Creek 36ck2 with a pin weight of 2700lb, trailer is about 14,500lb. We added airbags with onboard air compressor. Talking to a GM executive on trucks and he told me there is NO DIFFERENCE between a 2500 and a 3500 except for 1 overload spring. I saw a twin to my truck with the exception 0f it being a 3500 srw and looked at his door sticker, it said 3200lb load. So no problem we did up grade tires from a 285x60 x20 to a 285x65x20 and that got me a 3850lb load per tire, so no problem. We have pulled it with our Andersen hitch for more than 18,000 miles over 2.5 years.

That is helpful and encouraging. Thanks for sharing your experience. I took a look at the 285x65x20 and it definitely has the higher load rating. A tire size calculator shows it being a bit taller than my standard tire but still looks acceptable. According to the calculator, at an indicated speed of 60 mph, I would actually be going 63.7 mph.
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Old 10-11-2020, 07:24 AM   #19
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Yes it does change your speed a bit. I have a edge tunner on my truck that has the ability to correct for the tire size . I got the Goodyear , same as what is on the new 2020, 2021 3/4 &1 ton hd trucks. Do you have the 20" rims? I did loose not quite 1 mpg with the slightly more aggressive tread but MUCH better traction.
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Old 10-11-2020, 07:35 AM   #20
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Yes it does change your speed a bit. I have a edge tunner on my truck that has the ability to correct for the tire size . I got the Goodyear , same as what is on the new 2020, 2021 3/4 &1 ton hd trucks. Do you have the 20" rims? I did loose not quite 1 mpg with the slightly more aggressive tread but MUCH better traction.

I am currently running 265-65-18 with the original stock rims. I did look at some other size combinations that increase load capacity but so far what you are using seems to be the best option.
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