Hey NC4stroker, not to hijack your thread about battery capacity.....since battery capacity is important when boondocking. But if I can add something to your heater running constantly issue..... I had this same problem and found that during the cold nights my heater ran ALL THE TIME. Ran the battery down so low that I needed the truck to jump start the generator the next morning. Some guys said that I needed to change my HVAC thermostat as the RV cheapo units cant regulate the temp differences as well as the more expensive units, some guys talked about LED lights helping, others talked about making sure the HVAC vents are hooked up properly and not leaking or heating unnecessary compartments, and some talked about alternative heaters. After making sure everything else was in check I eventually did research alternative heaters and found that heaters like the Olympian Wave heaters not only use FAR less propane (which is expensive) but they also use NO electricity. Needless to say, I have one on order and plan on installing it before my next cold weather camping trip. I hear they work fantastic and can either be self standing in the RV or mounted recessed in a wall. Might be what you need too. Anything that doesn't use electricity extends battery reserve. Check them out. http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=6&cad=rja&ved=0CI4BELcCMAU&url=http%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3DUl5a-0e36iU&ei=wpV2Ury2D-qniAKf1YGAAw&usg=AFQjCNEy03yvI620bLiPglxGbxlh9EZQ3g&sig2=V6kMRor8Do_kxmBih8g :thumbsup: