If the TT has independent brakes I guess it might be ok, and the axles and suspension would only actually be holding the tow vehicle and hitch weight, right? (Just wanted to make sure I understand it right)
The trailer does have its own brakes and the trailer brake capability is part of what determines its GVWR (along with other items such as suspension, axle strength, frame rigidity, etc).
The truck has two jobs when towing: (1) PULL the weight of the trailer, and (2) CARRY the portion of the trailer weight that rests on the hitch. The truck's
pulling capacity is stated via the truck GCWR (Gross Combined Weight Rating) - the maximum combined weight of the truck plus whatever it is pulling. The trucks
carrying capacity is stated in the truck GVWR - the maximum amount of cargo weight that can be placed in or on the truck, including any passengers. The truck has to
pull the entire actual trailer weight but only
carries the portion of it that rests on the hitch.
We don't know the actual loaded trailer weight yet, so it is estimated to be equal to the trailer GVWR (the max is should ever weigh). We don't know the weight on the hitch yet either, so that is estimated to be 10% of the trailer GVWR.