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Be careful about what running both furnaces and what temperature you set them at. We were Camp Ground Host for Tiffin Motorhomes for 2 1/2 years and every winter we would have customers who came from up North and Canada who would say their furnace broke. My first question would be do you have propane. The answer was always "Yes, I filled up before leaving." Every time we got them into the shop it turned out they were out of propane. They had set the thermostat at 70 or even higher and ran out in 3 days or less. My suggestion is keep whichever furnace on that heats the basement (probably the rear one), and set the thermostat at 50 to 55 degrees while driving. Top off the propane whenever the gauge on the tank shows half full at a fuel stop such as Flying J or Pilot. Whenever, you stop to eat or rest you can turn both on, but at night I would consider setting them at 60 or 65 degrees max. I would really consider mounting a small ceramic heater in the wet bay that can run off the generator, especially when the temperature is likely to be in the low 20's or lower. Heaters have tip over switches and many have GFCI plugs. Do make sure you check it at least twice a day. Usually in the morning & at night before going to bed as a safety switch may have kicked in from rough roads or some other reason. If you have a plastic pan in the wet bay you might consider putting a piece of Styrofoam in the bottom of it to help insulate. We have mounted a curtain rod behind the cockpit area with heavy curtains hung from it to keep the dash heat upfront when driving. It also keeps the dash air-conditioning up front in warm weather.

I periodically put on the "cheap" gloves (I also have some high voltage Electrician gloves) and clean the bottom of the seal and the bellows. I then put a generous amount of silicone plumbers grease on the bottom of the seal and in the bellows. I keep a couple of small containers that are labeled for black water use such as the toilet and sewer hose gaskets. The reason for the plumbers grease is that it is designed for use in faucets and hose connections. It is waterproof and will not dry out gaskets and seals. I also keep one in my plumbing tool box marked for "Potable" water use.