Kudos to Campers Inn for doing the right thing

The dealer obviously agreed with the OP. If he thought the OP was asking for something outrageous the dealer would have simply declined the OP's request.
Another factor is did the dealer make money on the sale?
Most likely the dealer had enough margin in the sale to put on a set of tires and accommodate the OP without a making a fuss.
Did the dealer have to do it. Of course not but in the end the dealer agreed it was the right thing to do.