Towing a 32 foot with a Anderson convert a ball adaptor

I personally would not use that set up on a FW of that size/weight, due to the added stress on the FW frame, that is much lighter design, than an actual purpose built goose neck trailer.

You don't say what year FW, or how long previous owner has used it this way. If used like this long term, the damage may already be done. If used long term, no damage, you may get by with it, same as previous owner.

Jerry