If you have enough savings to pay cash, and if one of you is mechanically inclined, I'd say go for it.
Be aware that RV parts are expensive even when you do the work yourself. I'd budget a few thousand in the travel kitty to cover repairs - for example, one of your slide outs could fail, even in a recent model.
If you plan to finance the RV purchase with a loan, I think it's a bad plan since you'd be paying interest and easily could come back and be unable to sell for what you need to pay off the note.