Very cool. Based on the first photograph it appears you have 4 seasons. What sort of temperature extremes do you see outdoors and do you have to supplement the indoor temp with heat or a/c? Just looking for a general idea as to the weather to put into perspective. Keep updating, please.
Most RVs only have 1 inch thick foam insulation sandwiched between thin paneling for the walls, so yeah it can get extreme as to the amount of energy you need to supplement depending on the seasons. I have to keep mine heated\dehumidified 75% the year even if I'm not growing anything, or all my interior remodeling work would get wrecked by the moisture here in the PNW.
Probably the best thing you could do to any RV is add another inch of rigid foam throughout, and double the R-value no matter where your at or the environment your in. Most RVs are equipped with a built in propane furnace (helps to offset the electric heating cost), and some even come with roof top AC units already. However, the on board electrical system isn't good enough to run all that on top of all the added grow equipment, so you definitely need to bring in more power. Having a box on wheels sitting outside of the house does use extra energy at a cost, but well worth it IMO for the security and too many other reasons to list.
Some good ideas for winter grows, is to divide the RV into 2 flower rooms & run a flip flop with HIDs, so one set of lights are always on 24 hours a day keeping it warm. Rig up 2 motorized duct dampers to switch the exhaust flow every 12 hours, so its always pulling warm filtered air through the dark side of the trailer that is exhausted from the lighted side. Heaters don't grow weed, but extra HPS bulbs do!
I finally picked up another powered damper, and going to zone out the different grow areas in my 5th wheel, so its all all automated with digital controls that actually work together to help to dial in VPDs\etc. Or even close off the rooms when certain thresholds are met, putting them into c02 injection sealed mode, while other areas are still vented.. all depending on the weather and other factors, but mostly the plants that will be rigged up to sensors.
Still designing my own DIY multi core heat recovery ventilator, so I can capture upwards of 90% of the heat that would otherwise shoot out of the roof vents into the atmosphere outside, and mixing it right back into the fresh incoming cold air. HRVs are the way!