If going during the next few weeks (not during the dead of winter) your PC is deigned to operate with full plumbing functionality. Just make sure you maintain interior temperatures in the low 70's and all your outdoor storage compartments are always fully latched. All fresh water plumbing and the fresh water tank are inside the heated interior. It is the waste water that is outdoors, hence the need for the two waste tank heaters.
With our 2007 2350's particular arrangement of mechanical features, if we were camping in freezing temperatures consistently below 20F, I would add two 4" round vents on the side of the bed platform, placed as far apart from each other as possible, then mount a switched 12V computer fan into one of them to circulate room air under the bed to assure the fresh water tank and related plumbing stays warm enough.
The outside shower on our 2350 is inside the bathroom vanity and it is vulnerable to freezing. I would remove the shower hose with head, then stuff insulation inside it to protect the faucet in there from freezing. I would also add high and low mounted 4" round vents on the side of the vanity cabinet to circulate warm air via convection within the vanity.
These 4" round vents are sold at Home Depot.

With shore power available, it goes without saying that a couple of 110V 1500 watt cube heaters will be very handy.