Check your truck's owners manual on how to adjust a WDH.
Typical loading of properly adjusted WDH for RVers shows that 80% of TW is carried by the TV rear axles and 20% by the TT axles. So some TW is removed from the TV axles increasing payload. However, Ford and GM now (for 2014 models) only recommend restoring half the weight removed from the front axle. That would mean the TV rear axle carries about 100% of the TW, FA removes 10% and TT axles carry 10% of TW. Payload is not increased as much.
Study this on how to adjust your WDH after reading your owners manual.