Unhappy with deal. Want to cancel Purchase Agreement.

Probably not without a loss to you of some sort since there was nothing about any contingency in the original agreement. There SHOULD have been a contingency for securing financing at XX% written in up front. No problem canceling but you could loose some or all of your earnest money. You can likely get OUT of it with little or no loss if you find another unit from the same dealer and he may be willing to transfer the money to the new RV deal.