Hi,
If it is a self propelled RV (i.e. motor home) then there is a fixed tank. That means finding a gas station that sells propane.
Since you are going to be in campgrounds with power, pick up a 1500 watt oil filled heater. That means the campground gets to pay for much of the heating required.
Saving your spot probably means leaving a lawn chair or other item (cones anyone?) in the spot.
Unplugging a class C is easy. Disconnect the sewer, disconnect the water, disconnect the power--and drive. I'd suggest using a check list.