saw the "Cold weather camping" in the tittle and enjoyed the read and good info shared.
My wife and i do live in a mild climate weather wise here on the Oregon Coat, BUT we do full time in our RVs (Van Conversion, Parkliner
TT, and our main "Home" a 40ft 5th wheel). There might be a few tid bits to pass on...
When we are in our big rig (4 to 5 weeks out of 6 weeks) we are plugged into a 50amp service and run one of the small cube heaters down in the basement at its 750w setting when temps are near freezing (i set up a remote start, and this keeps the basement well above freezing). We prefer the little electric heater as i have to pay extra for propane
if i'm filling tanks with the current prices where they are...so i'll save a few bucks a month on heating with electric. Our temps in our Tesla T3970 toy hauler (new this October, traded in the 38ft Mobile Suite) stay about 30 degrees warmer inside running another cube heater at its medium setting of 900w. That is fine with us as we prefer the interior at about 55-60 at night.
When we are winter camping we go to one of the many State Parks in the Pacific Northwest that remain open year round and will use cube heaters in both the Van and Parkliner
. The PL has only one outer FG shell with a single layer of Reflectix on it so the little cube will run 80%on/20%off nearly all night at the 750w (rather than 1200w) setting and interior temps are a comfortable-for-us upper 60's for lounging before we head to bed in the Van Conversion. We know this little heater works like this as our two adult kids have spent nights camping in winter inside the PL on electric.
In the van it is a different story...included here as to the benefit of multiple layers (like your Olivers) of Reflectix/Shell. We have a 6 layer sandwich of bubble-wrap/Reflectix/bubble-wrap/Reflectix/Mylar/Hull Liner Fabric. The same cube heater at 750w setting runs at about 20% on/80% off and will keep the van at the same upper 60's...about 1/3rd the power needs as the Parkliner
Cheers, and happy camping! The Olivers are beautiful rigs.