Wow win! Plain out old WOW!! Now, that is the way things should be built! I know, you pay for what ye get, but man, I think it's worth it. In long run. And, I like to keep my things a long time. My Aerolite trailer is a '98 model, a very good trailer, but nothing compared to your Oliver. Double paned windows!! Yes! Pipes, drain pipes all inside - YES! Anything to minimize freezing, which I'm dealing with right now on my trailer. Busted pipe somewhere I've got to find and repair. Might be water heater with holes in it. A friend's trailer's water heater developed small holes in it. A thin aluminum sheet with styrofoam over it is all it was. I helped him put his new one in, and surprised at how flimsy those things are!
Oh me, here I am now after seeing yours, back to Oliver vs Class B...