If you end up looking at campers, be aware some are not insulated at all. Basically built for 3 season use not winters. We used to heat and stay in Austins enclosed 20' we had insulated walls and ceiling. But not the floor. We used some really good cots from Cabellas. With a 0 emissions propane heater it was a bugger to keep warm any colder than -10. More elbow room in it than this unit, but this one is super insulated. With windows its not claustrophobic more like cozy. We have both 12volt and 110 lights, inside and out (security, work, loading). Lots of 110 outlets (for charging phones I-pods, radio etc.) and thinking about microwave but we will have to get a bigger generator. Thhe 2000 watt is just over our 1500 watt electric heat. We bring my propane heater to bring it up to temp quickly when we park, and for emergency heat.
The bosses kids down at work have a 28' enclosed but no insulation. They've got a flat screen TV, DVD player and stereo in theirs. When they built it I joked, "It's got everything but a stripper pole."