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Old 03-12-2007, 02:09 PM   #1 (permalink)
GlockWRX
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Towing Capacity of LBZ 2500HD and 3500HD?

Hello all!

I am currently in the market for a new heavy duty diesel truck. I'm trying to decide to try to find an LBZ equipped GMC, 6.4L F350, or wait for an LMM. The trucks I am looking at are all crew cabs, 4wd, long box, SRW. My eventual goal is to tow a 5th wheel toyhauler with it. The model I am looking at is about 12k dry and about 15k gross. Pin weight is about 2600 lbs dry.

My concern is the conflicting info I'm getting about towing and capacity. Per the GMC website, the GMC 3500HD has a 5th wheel towing capacity of 14700 lbs, while the 2500HD is about 14200. I was at the dealership the other day and looked at their Sierra display/kiosk thing. The info there stated that the towing capacities were over 15k lbs for both the 2500HD and 3500HD (the 2500 was actually higher).

What is the right 5th wheel towing capacity listing for these trucks?

Thanks in advance for the help!
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Old 03-12-2007, 02:37 PM   #2 (permalink)
JoshH
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GCWR of both the 2500HD and 3500 SRW will be 22,000 lbs so the lighter weight truck can tow more weight (according to the ratings). The 3500 will have a slightly higher RAWR to allow you to carry a little more pin weight, but you could easily remedy that with a set of air bags on the 2500HD. If you want the most weight capacity you can get you might want to look into a 3500 dually. It is rated to gross 23500 and has a much better weight rating on the axle than the single wheel versions. Not to mention it will be much more stable towing the load.
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Old 03-12-2007, 02:38 PM   #3 (permalink)
racechaser1
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Tow ratings on 07 2500 HD

I cant comment on the 3500 but my soon to be delivered 2500 HD is as follows:
GVWR - 9200 lbs.
5th wheel trailering 13,600 pounds (down from 14,200 last year's model)
Curb weight of truck is 5983 lbs, plus 1,155 lbs in options = 7138 actual
curb weight of truck
9200 lbs less 7138 lbs. curb weight = 2062 available payload
2062 lbs available payload less 4 passengers and cargo and 5th wheel
hitch leaves you with 1050 lbs. available cargo weight.
Your 2600 lbs. dry pin weight of your trailer is 1550 lbs. over the allowable
maximum payload of a 2500 series truck. Do others do this with
add on air bags and the like? sure they do. Others use the GCVW
rating of 22,000 lbs and go from there. The bottom line is not to
exceed the rear axle rating of 6084 lbs on this vehicle for the
maximum payload including your pin weight. You also have to
consider the maximum weight carrying capacity of your rear tires.


I think your confusion between the 3/4 ton and 1 ton vehicles is that the tow rating on the 3500 SRW truck is 700 lbs. more that the 2500 HD SRW truck. The dually 3500 series can carry much more pin weight and is definitely a better and safer choice for the kind of weight that you are carrying.
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Old 03-12-2007, 02:45 PM   #4 (permalink)
GlockWRX
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Thanks for the info guys. I would prefer to stay away from the dually. My folks had one back in the early 80's, and my mom kept tearing the fenders off. Drove my dad nuts.

I figured the load would be too much for the 2500HD (it's too much for the F250 as well), but I distinctly remember seeing both the 2500HD and 3500HD as rated over 15k in a SRW config per the info at the dealer (this was GMC provided literature too, not something the dealer put together). I'll have to stop by the dealership and look at it again. Maybe my mind is playing tricks.
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Old 03-12-2007, 02:52 PM   #5 (permalink)
JoshH
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GVWR doesn't matter when your towing. As long as you don't go over your axle weight ratings you're fine. When you're towing you need to look at GCWR which, as I stated earlier, is 22,000. The only advantage the 3500 SRW has over the 2500HD is the overload pack on top of the leafs and 265 tires for more weight. Other than that there is no real reason why the 2500HD can't safely haul the same load as a 3500 SRW.
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Old 03-12-2007, 03:22 PM   #6 (permalink)
oteo125
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in my buyback on my 05 duramax the only weight gm seemed to care about was the gross weight. i wouldnt be to concerned about slightly overloading the rear axle as long as you dont exceed the weight the tires can handle. i have never seen or heard of anyone breaking a rear axle or springs.
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Old 03-12-2007, 03:33 PM   #7 (permalink)
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265s on LMM 2500 HD

The new 2007.5 LMM 2500 HD's come with 265 tires in a 17 inch setup if you order the LTZ package. The tire weight rating is around 3200 lbs. each tire.
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Old 03-12-2007, 08:37 PM   #8 (permalink)
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Forget about the "tow ratings." Any diesel will "tow" just about anything. As noted above, the problem with the 3/4s is the cargo capacity...when you take the cargo capacity for a stripped down truck and subtract the weight of the D/A, weight of the hitch, cargo, passengers, tools, etc, there is not much left.

If you want to determine the actual cargo capacity for a specific truck, look at the sticker that is located on the pillar between the front and rear doors on the driver's side. It's called "Tire and Loading Information." It has all the data on the OEM tires as well as a section that says "The combined weight of cargo and personnel should never exceed____pounds." That figure is the cargo capacity for that truck.

Lots of people will tell you it's okay to tow over weight, or just don't exceed axle ratings, etc...here's a quote for you:

From Trailer Life 2007 "Guide To Towing", page 14:

"The GVWR figures are neither guidelines nor estimates; they are limits, and there are numerous valid reasons the manufacturers arrived at the figures given. If you think these figures are "close enough" or have a fudge-factor percentage built in, think again. Your warranty coverage--and your safety--may be at risk".
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Old 03-12-2007, 08:49 PM   #9 (permalink)
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Inside my driver door, The combined weight and cargo should never exceed 2351 lbs. So long bed 2500 cargo might be alittle less. Even with upgrades like air bags, on the firestone ride-rite box it says (do not exceed your GVWR) Mine FRT GAWR (4120 vs 4670) RR GAWR (5260 vs 6084) 2500 lbs. Pin weight of my 5er +750 lbs. People + 182 lbs. Fuel + Hitch, nerf bars, Line-x, fold-a-cover, fire wood. GVWR (3700 vs 2351)
(11,800 vs 14,200) (18,800 vs 22,000) So it looks like I'm over just on one. I don't know the GVWR of a CC/LB Dually is, but its more than my 2500
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Old 03-12-2007, 10:43 PM   #10 (permalink)
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Quote:
Originally Posted by JoshH;1648936;
GVWR doesn't matter when your towing. As long as you don't go over your axle weight ratings you're fine. When you're towing you need to look at GCWR which, as I stated earlier, is 22,000. The only advantage the 3500 SRW has over the 2500HD is the overload pack on top of the leafs and 265 tires for more weight. Other than that there is no real reason why the 2500HD can't safely haul the same load as a 3500 SRW.

A 3500SRW with a 5th or gooseneck trailer has a GCWR of 23,200LBS. From my manual.
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