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Bobby, the tow rating is really just a convenient number derived by the manufacturer from other numbers. In my opinion it is not as important as the other ratings. I have no idea the exact formula for tow rating. But the numbers I think you might want to look at are as follows. Where I show GCW and GCWR, GCW is the actual scaled weight and GCWR is the rating.
1. GCWR (GCW is total weight of truck and trailer as actually going down the road with all passengers and gear onboard)
2. GVWR (GVW is total weight of the truck with everything loaded as going down the road. This includes the pinweight of the trailer but not the weight on the axles of the trailer. It can be determined by adding the actual weight on all truck axles.)
3. GAWR, both front and rear axles. (GAW is the actual weight on an axle)
4. Tire weight ratings.
If I've missed anything, someone please jump in.
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