2x 6 volts was the norm before the advent of the deep cycle battery. Now with the deep cycle being cost effective, and the warranty they have it doesn't make sense to go with 6V. Costco is the best for price on deep cycle.
I see lots wanting a gen set to charge the camper , but in reality the truck will recharge the camper faster and cheaper than solar or a generator. I leave the gen set home now.
The camper is wired with welding cable from the battery's to the isolator in the truck, so in a pinch I have 5 battery's available to self boost should I leave lights on in the truck etc. and need a boost, or when running the winch. { Costco 12000# Champion winch can't be beat. } I use a HD quick plug to jump the campers battery's to the truck's battery's bypassing the isolator if needed . Pop the hood and plug it in , 30 second job.
I have a maintainer/charger wired in the camper that keeps my battery's toped up when it is home. On the road the truck charges them when driving. I switched all the lights to LED from Amazon. brighter, and very little drain, and inexpensive.
I put a jumper on a quick connect HD plug on the isolator so in winter when the unit is parked the maintainer charges the trucks 2 batterys and the campers 3 batterys. It is parked till spring, and pluged in on a timer to minimize power to a few hours on a day.
12 V / 120 V inverters are cheap now , and I wired in a 1500 watt permenantly for the few times I need 120 , like to plug in a laptop.
In reality I don't use a lot of elect power. I use propane lamps for most of the light I need , and refill the 1# bottles so they are cheap to run. As soon as I park the fridge gets switched to propane , from 12 volt on the road power.
Unless you use a lot of elect power it isn't worth it adding solar and gen sets. Fortunately my furnace is gravity operated and doesn't use any power other than a computer fan to give some air movement if it's realy cold out.. Those little fans don't use anything, and will even run off a 9V Duracell.
My camper is an older slide in , it does all I need and is warm, dry and permanent on the truck. I think I have the bases covered for economical power/gas consumption in a setup that works and is easy .
The only thing I want to add is a remote start so I don't have to go outside at -20 to start the truck to recharge the camper if I need to .
or keep the old diesel warm enough to start when it gets -20 or below. That's coming when the weather warms up. In real cold camping I do bring the old 900 watt Honda gen set just in case I need to have the block heater on for an hour in the morning. It also has a 12 volt connection that can charge too, if things get real bad.
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