Calling all Road Warrior owners - RWS, RWT, RWM

I have camped in mine year round. The coach is surrounded with 2” thick foam board which I think is an r-10 value. I also put heat tape on all my piping and tanks. No problem yet. I have to keep the shades drawn because the windows are not double pane. The worst part is trying to find somewhere to dump the sewage tank, as most places close their dump stations water in winter. So I can’t flush except with the grey water washout after dumping the sewage.