Why not just ask the seller what the lowest prices is that he will accept? If he says $70K than you just say "I'm sorry, that is more than I am willing to spend".
What he says next will tell you a lot. If he indicates that he might take a lower offer, than you know that he lied when he said that $70K was the lowest acceptable figure.
If he directs you towards another, less expensive, coach, it may indicate that $70K was indeed the lowest price that would be taken on the first coach.
It is a game but you will not win if you show your cards first. Make the seller give you the lowest figure and go from there.
If you are paying cash, you have more bargaining power, at SOME RV lots. Some RV lots do make additional money on financing an RV and are less receptive to cash offers. Others will jump on an all cash sale that can be closed that day.
Use what you have but don't tip your hand until you are certain that this is the coach that you really want. Once you have decided that you want a specific coach, then you can use everything that you have to get the best price.
