That's a good looking 5er, congratulations! Just because a trailer has an aluminum frame and structure does not mean the 5er is immune to dry-rot/water damage. Water intrusion is still a hazard, it can de-laminate the walls which were squeezed together while the water-based glue dries. Re-sealing even the tiniest of cracks on the roof, corners, and around every wall opening, is vital to protecting your investment from water damage.
The trailer can sustain water damage from inside; condensation is a major problem during full-time cold weather living, as you may already know.
You two are to be commended for braving the working and living conditions in the cold North oil fields.
2000 Winnebago Ultimate Freedom USQ40JD
, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member."We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert theConstitution. "Abraham Lincoln"