My setup: Older 30 ft leyton trailer, free from a friend - works fine until the cabin is built
existing septic, directly connected
30 amp rv box electric hook up, w additional 20 amp supply
submersible pump run to nearby creek for water supply w/filter - works fine for showers ect
newer propane rv furnace - PLENTY of heat, uses little propane
propane range, oven
backup electric heater,
electric 20 gal water heater
quick connect winterize kit, a must have
plan to connect existing well in future
The rv propane heater works fine even on cold nights. I am leery of any type of heating system in confined areas, but i have multiple smoke detectors and a co detector. The propane does produce a lot of condensation on the interior of the windows. My 8 cyl f150 towed the trailer fine on a 300 mile trip (no 5th wheel). I will second buckhunter in having the roof resealed no matter what condition it looks like. I've seen trailers 3 years old with severe rot from a leaking roof. It cost me a few hundred bucks to have an existing meter pan updated and inspected. I would def look into having electric run, everything in the trailer uses it. Its often free to a certain point on your property depending on the power company.