New or used, being handy is helpful. Wouldn't drive the choice for me. Don't count on new being trouble free. Everyone we know who has bought new has lost at least a month of RV time to "warranty" work. You might not get charged for warranty work but you still pay to drive the unit to the dealer and you still lose the use while it's in the shop... and people paying actual full price in cash go in line ahead of you for work.
The biggest thing is make sure there is no water damage. If you don't know what to look for...once you have a unit you think is good (do your best), make an offer contingent upon an inspection, then pay for a mobile RV tech to come out and look it over. Might cost you $100-150 but if it steers you away from a boondoggle, it's money well spent.