rbpru wrote:
The question is, do the torsion bars increase the vehicles “max cargo weight” by any more than the amount transferred to the TT?
When the spring bars are connected, weight seen by the hitch is decreased as load is transferred to the other axles - truck and trailer. This means that the truck rear axle will see some lightening and the front axle will see some increase. It also means that you should then be able to dump more load into the bed of the truck to bring it up to the axle rating, providing the spring bars and all other components (including trailer axle) are not overloaded. So the answer is YES.
The amount of "increase"can only be determined using a scale, and is not just the amount transferred one way (i.e. to the TT).