We have a 2013 277RLSS. We have had no real problems with it. We full time now (last four months) and feel we have ample storage. Ours is a little smaller than yours but the layout is similar. We use the overhead cabinets above the back window for pans, glasses, and tupperware. What you have labeled (in the pic above) as linen,we use for a coffee station. The upper cabinet holds all our cans and jars, etc.
The mattress isn't that good - we have a 4" memory foam pad on it - very comfortable.
We replaced the showerhead - definitely a worthwhile upgrade when trying to conserve water. The water heater gets the water VERY hot - we can take two showers on its 6 gallon capacity.
Ours had no 12v jacks - we added two and are considering adding a third. We also added 2 6V batteries and 400W of solar.
We have had no problems with pipes freezing. However, I will note that while the insulation is better than our last tt, it isn't as good as I would like. If one is parked in direct sun, the tt will heat up fast. This is great during the winter and really cuts down on the heating but during the summer, the one a/c we have struggles to keep the temp down to bearable. You might consider a second a/c in the bedroom if you will be parked in a sunny area.
