Add another battery?

. How do you use a generator?? - Do you use it only when you run something electrical, or do you use it to actually charge/recharge a trailer battery??

We run a generator to watch movies/use the microwave or air conditioner and especially, to keep the batteries at full charge.You don't need 6 volt batteries, two or even one rv
battery will do with the ability to recharge it whether by generator or other means.

I spend almost 100% of my rv time,in the hills without hookups.Solar is not an option where I camp and in my opinion,its way to expensive for what you get.

For less than $200 you can get a brand new Champion generator and keep your batteries full and run the microwave to.In my case,I have two Hondas, one 2k and one 3k that I use the most.The 3k when its hot out and may want to run the air and the 2k the rest of the time.

If you don't want to spend a bunch, just hook up your truck to the rv battery and charge it or them via jumper cables.Also, use a catalytic type heater which uses no battery power.Like you, living in Idaho gets cold and nothing runs down a battery worse than the furnace.