I've shared this before, but we kept our 30A RV powered up in the drive on a standard 15A outlet for years. Biggest load it had was the AC, which it handled just fine, even with the TV and lights on. The only gotcha would be the microwave; can't do it and the AC together. As far as the heater, we used the furnace, which is LP and actually runs on 12V, not 110V.
2015 Legacy SR340 360RB
2014 Jeep Wrangler Unlimited Toad
Gigi, Poppy and Sadie Lady...On the road, but not full time!