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Old 05-09-2012, 05:19 PM   #1
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I've done my homework... can you help double-check my numbers?

I've done my homework and read up extensively on towing. I've finalized the model RV and Truck I think I should get. Can someone volunteer to help double-check my numbers for me? I'd be very grateful!

Truck: 2012 GMC 3500HD Ext Cab SRW 2WD Duramax Diesel 6.6L V-8 Turbo
5th Wheel: 2012 Columbus Palomnio 320RS

Changing Gears Calculation: (with numbers filled in)
Fifth Wheel Weight Calculator

11,600 Tow vehicle GVWR
24,500 Tow vehicle GCWR
17,300 Tow vehicle maximum loaded trailer weight rating
??? Tow vehicle maximum king pin weight rating
7,050 Tow vehicle RGAWR
6,741 Tow vehicle GVW
??? Tow vehicle RGAW
10,604 Fifth wheel trailer GVW (or GTW)
2,015 Fifth wheel trailer king pin weight
20% Safety margin

RESULT: The Maximum Trailer Weight of 17,300 is less than the trailer when fully loaded at the Trailer GVWR of 14,080. However, I'm a bit shy of the 20% safety margin at 13,840. And at maximum trailer weight, estimating 25% as pin weight I'm under what the rear axle can handle.



REFERENCES:

Sierra Specs:
2012 GMC Sierra 3500HD Capabilities | Heavy Duty Pickup Truck | GMC

Sierra Brochure:
(PDF page 40; Actual Page 38)
http://www.gmc.com/content/dam/GMC/g...a-brochure.pdf

2012 Columbus Palomnio 320RS
Palomino RV - Manufacturer of Quaility RVs since 1968
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Old 05-09-2012, 05:22 PM   #2
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I did my homework, but my dog ate it
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Old 05-09-2012, 05:38 PM   #3
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[QUOTE=Frogz;193531]I've done my homework and read up extensively on towing. I've finalized the model RV and Truck I think I should get. Can someone volunteer to help double-check my numbers for me? I'd be very grateful!

Truck: 2012 GMC 3500HD Ext Cab SRW 2WD Duramax Diesel 6.6L V-8 Turbo
5th Wheel: 2012 Columbus Palomnio 320RS

Changing Gears Calculation: (with numbers filled in)
Fifth Wheel Weight Calculator

11,600 Tow vehicle GVWR
24,500 Tow vehicle GCWR
17,300 Tow vehicle maximum loaded trailer weight rating
??? Tow vehicle maximum king pin weight rating
7,050 Tow vehicle RGAWR
6,741 Tow vehicle GVW
??? Tow vehicle RGAW
10,604 Fifth wheel trailer GVW (or GTW)
2,015 Fifth wheel trailer king pin weight
20% Safety margin

You are solid provided your 5th wheel hitch is rated for at least 12,000 pounds. ??? Tow vehicle maximum king pin weight rating
I would get one that can handle the maximum camper weight your truck can tow. (say 16,000 pounds)

??? Tow vehicle RGAW is the actual weight with the camper on so you won't have that in this case so you leave it blank.

The 20% safety margin is really not "safety" per se. It is how much under your max possible you want to routinely operate. 20% under will give you plenty of power for hills and stuff; but you can get away with less if needed.

I am thinking you are going to really like this combination.
Safe camping.
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Old 05-09-2012, 07:35 PM   #4
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Thanks for your help!

We're going to be full-timers and over the next year we could log as many as 10,000 miles and stops at nearly 50 parks so we're getting a nice hitch with airbags to smooth out our ride. Specifically this one with the Holland/Binkley hitch:
25K 5th Wheel Air Hitch
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Old 05-09-2012, 08:08 PM   #5
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Quote:
Originally Posted by Frogz View Post
Thanks for your help!

We're going to be full-timers and over the next year we could log as many as 10,000 miles and stops at nearly 50 parks so we're getting a nice hitch with airbags to smooth out our ride. Specifically this one with the Holland/Binkley hitch:
25K 5th Wheel Air Hitch
Well THAT should certainly do it.

Plug in 25K in that slot on the calculator and rerun the numbers.
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Old 05-09-2012, 08:25 PM   #6
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My $.02, the 2500HD is rated at 397 hp vs. 360 in the 3500. Also the 2500 has TPMS and the 3500 does not, data from the Duramax forum. Things may have changed for 2012.
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Old 05-09-2012, 09:01 PM   #7
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Thanks for the feedback MIKE44460. I actually couldn't much difference between the two models. The PDF I found lists them both with 397 hp. Maybe something changed?

I did notice the 3500HD can handle 7,050 on it's rear axle while the 2500HD can only handle 6,200. I'm sure a "truck guy" could find other differences, but as I need to be able handle all the pin weight and truck cargo that I can, I'll take the extra 850 lbs.

This trailer in particular puts the washer and dryer and a large closet right over the hitch so I'm expecting a higher pin weight once we're all packed up. (I do plan on weighing it on the way home from the dealer so I know how much we can add.)

I can't wait to pick it up!

Sierra Brochure:
(PDF page 40; Actual Page 38)
http://www.gmc.com/content/dam/GMC/g...a-brochure.pdf
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Old 05-09-2012, 09:32 PM   #8
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The GMC web site has the same Duramax engine in both the 2500HD and the 3500HD 397HP at 3000RPM.

The TPMS shows as "STANDARD" on the 2500HD and "AVAILABLE" on the 3500HD.
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Old 05-09-2012, 10:00 PM   #9
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Quote:
Originally Posted by herk7769 View Post
The TPMS shows as "STANDARD" on the 2500HD and "AVAILABLE" on the 3500HD.
For Tire Pressure Monitoring, I'm planning on getting a Hopkins system so I can monitor the tire pressure of the trailer wheels as well. It will also give me more information than I've had in previous vehicles.
Hopkins Tire Pressure Monitoring System - Hopkins Mfg Co 38100VA - Tire Accessories - Camping World

I've had A TPMS on several other vehicles and I found it quite annoying. A light comes on to tell you that air is low in one tire. How low? Which tire? What's even worse is that once a sensor broke and it didn't bother to tell me that - just the same unintuitive and panicky "check your tires" light. A name brand tire installer shop had a lot of difficulty figuring out what had happened. Only the dealer seemed to be able to fix it.

At least with the system linked above I'll know which tire, what PSI, and I'll have a Green, Yellow, Red warning so I know how urgent the situation is. It's not cheap as I'll also need an extra set to cover the rest of the tires and with a 37' trailer the repeater is recommended. The peace of mind will be worth it and will compensate for the minivan with "run flat" tires I'll be leaving behind.
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Old 05-09-2012, 10:44 PM   #10
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Quote:
Originally Posted by herk7769 View Post
The GMC web site has the same Duramax engine in both the 2500HD and the 3500HD 397HP at 3000RPM.

The TPMS shows as "STANDARD" on the 2500HD and "AVAILABLE" on the 3500HD.
Our 2011 is 397hp.
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