If I were the buyer, I would not want to hand over a check or money unless the other party was ready to hand me the signed title at that point. Taking possession of a vehicle without having the title signed over is no less risky than accepting an unverified large check, just for the other party--without the title, you in theory could claim the vehicle is stolen and make life very difficult for the buyer. (I'm not in any way suggesting that you would do that, of course, just describing the sorts of things that a buyer worries about.)
If your motorhome is financed through your bank or credit union, perhaps the easiest thing would be to meet there and have them verify the payment (hopefully cash, a bank check, or a wire transfer, which often could be verified more or less on the spot), and then release the lien and give you the title to give to them, along with the keys, bill of sale, etc.
J&R's suggestion to ask your lender is very good.
