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Old 06-28-2019, 02:34 AM   #1
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Truck GVWR

I thought I knew GVWR pretty well, but trucks are throwing me off. A trailer GVWR is based on the limiting factor of axle rating (or tire) and design pin weight.

However what is the limiting factor that truck GVWR is based on? If an F350 SRW quad cab has a 7,000 lb Rear axle capacity and 6,000 lb Front axle capacity and tires rated at 3,650 lbs each, why is the GVWR on only 11,500 lbs rather than the full 13,000 lbs of the axle capacity?

My daughter daughter bought a LANCE truck camper that is just cool as it can be but we are trying to figure out her capacity.
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Old 06-28-2019, 02:44 AM   #2
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Brad,

Ive always wondered that myself...

My tires combined are rated for 3750#, or a total of 7500# and my axle capacities have always been close, but under..the 7100# listed

Those are the 2 limiting factors in my eyes... weakest links...
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Old 06-28-2019, 02:59 AM   #3
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Quote:
Originally Posted by atom ant View Post
I thought I knew GVWR pretty well, but trucks are throwing me off. A trailer GVWR is based on the limiting factor of axle rating (or tire) and design pin weight.

However what is the limiting factor that truck GVWR is based on? If an F350 SRW quad cab has a 7,000 lb Rear axle capacity and 6,000 lb Front axle capacity and tires rated at 3,650 lbs each, why is the GVWR on only 11,500 lbs rather than the full 13,000 lbs of the axle capacity?

My daughter daughter bought a LANCE truck camper that is just cool as it can be but we are trying to figure out her capacity.
Brad I just checked my truck and axle weight adds up to 15000 lbs and GVWR is 13025 lbs
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Old 06-28-2019, 02:23 PM   #4
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That's strange they stay short of the axles and tires. I told her at the very least make sure not to overload the rear tires, or even the axles, but I think she is already over GVWR.
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Old 06-28-2019, 02:55 PM   #5
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Brad, no rhyme or reason on some of their numbers. If you think she is OK with the setup, I would run it across some scales to see exactly what the setup weighs and if over the GVWR I would see if the Truck can be licensed for a higher gross. I knew with our Pin weight, hitch, tool box and everything else we carry that I was close to our GVWR so I have my Truck licensed for a gross of 14,999 Lbs, was going for 15K, but that was the next price bracket. So I'm licensed for the weight I'm carrying.
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Old 06-28-2019, 03:15 PM   #6
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Brad, I think you're limiting factor will be the rear axle and tires with the camper. With the camper on it will probably unload some of the weight off the front axle.
I've wondered the same thing as far as GVWR and the conclusion I came to is that this is what the axles are rated for and this is the max we want the truck to weigh - you figure it out how you want to load it. For instance if that same truck had a commercial snowplow mounted on the front, you'd very quickly be close to the 6k front axle rating.

Kind of like loading a small plane for weight and balance. "This is how many pounds you can carry, distribute it the way it works best"
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Old 06-28-2019, 03:27 PM   #7
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I have never been able to make sense of the GVWR ratings. I had an F250 rated at 10000 GVWR. The tire label indicated 65 psi front and 65 psi rear. An F350 had identical parts: axles, springs, wheels, tires, rear overload springs, etc. but was rated at 11500 GVWR. The only difference I could see was the tire label called for 65 psi front and 80 psi rear. I think it is more important to make sure you aren’t overloading the weakest component wether that is the wheels, tires or axles, etc. Of course an overloaded vehicle doesn’t ride very well so that might determine the practical limit!
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Old 06-28-2019, 04:40 PM   #8
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One thing that confuses a lot of people is the rear axle ratio. With all other equipment being the same (including bed length), 6.0 liter GM shows towing capacity at 16,600 for 3.73 ratio and 21,100 on the same truck with 4.10. I can only assume ring and pinion gear/transmission heat would be the limiter....
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Old 06-28-2019, 05:16 PM   #9
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Thanks all,
She is at 11,700 without food and water, with a GVWR of 11,500. I showed her your comments and told her to load it and CAT scale it again, with the 7,000 lb axle weight being the red alarm, and the tire capacity of 7,400 or so being the absolute no-go.

Gotta love that phone in CAT scale app where you don't have to reach up to that button!
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Old 06-28-2019, 06:43 PM   #10
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I hate to say it Brad but a dually may be in her immediate future if its a really big Lance. I looked at their big one and the first words out of the Salesman's mouth (believe it or not ) was "don't even think about this one unless you've got a Dually".



Amazed me, a sales person that actually wan't lying !! Spent the next hour talking to him and may seriously consider one now that we're stationary here for a while.
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