Will you be staying in an RV park with full hook-ups "working", boondocking, or at someone's house with available 30 amp electricity? Your implication states "RV park with all working hook-ups". Please confirm.
If you don't have on-site fresh water, sewer, and at least 30 amp electricity working during your winter stay, I imagine you will be moving the motor home routinely for gasoline, dumping sewage, and replenishing water. At that point, going the extra mile with skirts, or better-yet hay bails for insulation, will be very painful to manage.
I wonder if a huge propane tank including delivery and maintenance can be rented.