First thought, have you installed the high-altitude jet in your Honda generator? At 9,300 ft I'd rather not be running rich and risk fouling the plug. At least bring a spare plug and wrench.
Second thought, do you have a list of things to do at night to give your heater all the help you can? For example, close all curtains/blinds, get the pillow insulators for your overhead vents, close the stove vent, etc.
We're in our second year of TT camping and getting more and more comfortable with dry camping/boondocking. With 2 batteries we know we're good for 1-2 nights of getting down into the 40's and running the furnace at night. Our other electric demands are few as we have LED lights and typically run the electric stabilizers and slide out while still hooked up to the truck to share a little bit of that current draw.
If you have 1 fresh battery and will be hooking it up to the generator each morning for a few hours through a good charger, you'll do fine.
