Can 'O Worms: how long can I expect my 5er to last?

Depends a lot on how well each brand was manufactured. And how well cared for. I sold my 2007 Montana last year after owning it since buying it new. It was still as solid as the day I bought it. No exaggeration. I’m sure some brands are even better. And some not so much.

I think the 10 year rule is just an arbitrary number in an attempt to keep older run down units out.