Originally posted by Loren
I don't know about all model years, but generally the tow rating on the 3/4 ton trucks is slightly higher than for the one tons. This is because the truck itself is slightly lighter.
Which illustrates how much manufacturer's towing ratings are worth -
not much!
To explain, in towing 5th wheels, since the 5th wheel will typically put up to 20% or more of its total weight on the truck as pin weight, a 3/4 ton or SRW 1 ton truck will run out of
GVWR long before it runs out of
GCWR. The only way to know if the truck will handle a specific 5th wheel within its ratings is to run the numbers:
Truck GCWR - truck laden curb weight = maximum laden trailer total weight
Truck GVWR - truck laden curb weight = maximum laden trailer pin weight
In these equations, truck laden curb weight is the actual scale weight of the truck with driver, passengers, all options and accessories, fuel, cargo, hitch, etc. Manufacturer's towing ratings (1. ) totally ignore the GVWR issue and (2. ) are normally calculated for "base vehicles" (i. e. , no options or accessories) with only a 150 lb driver. Not very real world, huh?
When we ordered our truck (see signature), it was specifically to tow our 13,500 lb 36' 5th wheel. As weighed on certified truck scales, we hit the road at 21,180 lbs GCW (21,500 lbs GCWR) and 10,380 lbs GVW (10,500 lbs GVWR). We bought the truck to fit the job we were going to use it for.
Rusty