Towing Cyclone 4100 King

If he is under his legal licensed weight to tow, then who is going to tell him he cannot buy that unit? I agree that the 5th wheel is waaay too big for his 3/4 ton truck, but I don't agree that the dealer is legally liable if the guy tries to tow that unit if his truck is licensed for the weight. Once the dealer has apprised him of the inadvisability of pulling that unit with his truck then the dealer has, IMO, no legal recourse to deny the sale. Seems to me that denying the sale in those circumstances leaves the dealer open to breach of contract.

I've seen quite a few posts on here, and other forums, of people pulling 16,000 lb., and heavier, 5th wheels with 3/4 ton trucks.