One thing to bear in mind, with any RV your roof is either leaking or about to leak. You must be diligent with checking your roof and caulking as even a tiny opening is going to leak an it will not be long before your roof is soft. Think about it that thin skin over the rubber roof is sitting out in the sun and weather 365 days a year. Before you buy anything used insist on getting up on the roof and checking it out. Oh yes those crank open vent covers are a leak waiting to happen they become brittle 1-2 years from new invest in covers for them.
