Not full time by any means, but it's always outside year round and it's a 2003 model year Fleetwood Prowler, but I bought it in July of 2002 and it's still dry, solid and all mechanical's functional..
Maintenance is ongoing and keeping it clean, serviced and happy makes me happy.. :)
Mine specifically said in it's manual that it's not meant to be a "full time" use RV, so there you go there... But, it's only a $14,000, 22', #5000 RV too, so there you go right there... I'll bet your 5ver cost a bit more, is bigger and heavier.. ;)
Good luck!
Mitch