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Old 08-15-2012, 04:37 PM   #1
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Forum don't fail me now! Our TV is a 2011 Chevrolet Silverado 2500HD 4x4 crew cab standard bed with the Z71 off road package and 373 Axle ratio. We are going to upgrade to a 4.10 Axle ratio to give us more towing capacity. Per the Chevy manual with a 4.10 ratio our max fifth wheel trailer weight is 13,900 lbs. has a GCWR of 20,500 lbs. and a max hitch pin weight of 3,000 lbs. The Gawr FT is 5200 lbs. and GAWR RR is 6200 lbs.Truck weight (with me, DH, dog, and supplies we normally carry in truck is 7340 lbs. (no hitch - waiting to buy camper). Estimate a fifth wheel hitch weighs 175 lbs. I want to buy a Chaparral light(outside kitchen, bunkhouse and 2nd bath - woo hoo). The specs for trailer are: hitch weight=1900, Dry weight=10,500, Gross weight=13,000, Cargo weight=2810. I think I remembered every thing. I factored a 15% king pin override and 10% safety margin. I really want this trailer but want to make sure we're safe. Will someone please check my figures, tell me if I'm fooling myself or if they think I'm Ok. We tow with some food and maybe 8 gallons of water in case we need to flush ( we consider this part of the cargo). Thanks in advance for your support.
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Old 08-15-2012, 04:45 PM   #2
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Take your trucks AS SCALED READY TO CAMP WEIGHT, minus the GCWR of 20500. That is how much you can pull. Regardless of what GM says those are the numbers. By that number I have to assume you have a 6.0L gas motor? The vast majority of fifth wheel trailers calculate pin weight as 20% not 10 or even 15% of the trailers weight. So, if you were foolish enough to attempt to pull a 13K fiver your pin weight should be very close to 2600 pounds. I have serious doubts that your truck will have that much capacity when all loaded ready to camp. Toss in 6-8 MPG towing economy and I see nothing good of this combination.
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Old 08-15-2012, 04:49 PM   #3
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Your also looking at a grand or more switching from 373 gears to 410's
Remember you have to do front and rear differentials.
Truck computer needs recalibrated as well.
Ron
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Old 08-15-2012, 04:55 PM   #4
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Quote:
Originally Posted by donn View Post
...Regardless of what GM says those are the numbers...
And just who is the ultimate authority on this? I would imagine GM has competent engineers that have determined by tests what the vehicle they designed is capable of doing.
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Old 08-15-2012, 05:04 PM   #5
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Quote:
Originally Posted by f1100turbo
Your also looking at a grand or more switching from 373 gears to 410's
Remember you have to do front and rear differentials.
Truck computer needs recalibrated as well.
Ron
Oh, yeah. Already checked it out. They want $3500. Since it's a new truck, to keep the warranty, we have to have the dealer do it.
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Old 08-15-2012, 05:19 PM   #6
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You might forego the gear change. Most of the 5ers I see are in the 13k - 15.5k range pulled w/ TVs w/ 373:1 gears w/o issues or problems. Find yourself a good hitch, one that will slow for upgrade later . I'm partial to the Curt 20k for my requirements. No "high hitch" problem like seen w/ Drawtite/Reese hitches. Hook up is much easier also.
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Old 08-15-2012, 05:25 PM   #7
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I hope you have a duramax with that heavy of a trailer.
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Old 08-15-2012, 05:28 PM   #8
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... No "high hitch" problem like seen w/ Drawtite/Reese hitches. Hook up is much easier also.
Why is the Curt not susceptible to high hitch?
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Old 08-15-2012, 05:51 PM   #9
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If you use "DRY" numbers for a "form factor" ratio of weight to pin, the 10,500 pound camper is right at 18% pin.

If you load properly you should be able to maintain this weight ratio with very little trouble.

So if you load the camper to its max weight of 13,000 you will have a 2350 pound pin load.

If your truck (with hitch) weighs 7500 pounds your max trailer weight is 13,000 pounds based on GCWR.

If your GVWR for the truck is greater than 9,850 pounds (7500 plus pin) you are right where you should be.

You might not be happy with the mileage, but Hey; We are on vacation!
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Old 08-15-2012, 07:20 PM   #10
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Quote:
Originally Posted by dunnnc

Why is the Curt not susceptible to high hitch?
The design keeps the forth wheel platform in the hitched position all the time (rubber grommet on the base) plus the fact that the lock pawls won't lock till the pin is fully engaged in the locking pawl. I simply back into the hitch, drop her into drive & "click" it's latched.
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