Dan, you're an avid cold weather camper ... but IMHO letting the inside be in the low 30's is over the top (or under the bottom)!
Please do something to relieve my pain when reading of your cold weather RV camping sagas. Perhaps you should change your heater to a quiet one ... like for instance this one:
http://www.propexheatsource.com/heaters/hs2800-furnace/OR
My BIL has a wonderful new 21 foot Escape TT with some kind of furnace in it that makes practically no noise at all - and his DW is extremely sensitive to her sleeping environment. It's probably one of these models, which I believe are used in Escape trailers:
http://www.ducktec.com/itmidx14.htm
