For us, ALL residential appliances. Residential Fridge. Great shower head just like at home (no oxygenics for us!). Household water pressure (2 water pumps). Baseboard heat (Webasto/Aquahot). Electric fireplace. Convection oven. Gas cooktop (might replace it with Induction in the near future). 3 A/C units and a large generator to ensure everything works even when not connected to shore power. Satellite TV (Trav'ler or Eagle antenna) plus the best MiFi device(s) for cellular internet connectivity.
I like RVing but I like RVing best when I have the same creature comforts of home in my RV.