The unloaded pin weights of trailer units are published. The loaded pin weight can be estimated based on the published weight or by asking a person with experience the pin weight of specific units. The carrying capacity of all trucks is posted somewhere in every truck as set by the manufacturer. There should be no doubt about how much carrying weight a truck will bear. It is really up to the buyer to do their research before buying either a truck and/or a trailer to determine the pin weight is within the truck manufacturers set capacity. It takes a little research before buying either a truck or a trailer to make sure the trailer is within the carrying capacity of a truck. Unfortunately, a truck or a trailer is purchased before the capacities are determined. Been there, done that. There are many grossly overloaded single rear wheel trucks hauling heavy 5th wheel trailers but it seems to work for most of them.
