Thank you all for some good suggestions. I found this web site that shows the proper way to cable up multiple batteries and the generator. www.impactbattery.com Might buy solar panels at a later date.
As far as to where to place the batteries, I haven't come up with a perfect location, my trailer tongue weight is heavy with 2 @ 30 lb LP bottles there already. I do use a 15k Reese weight distribution hitch and have Firestone airbags on my F250.
Permanently mounting inside the trailer isn't going to work because tying into the existing 12 volt cables would require a lot of bending and kneeling down which is very painful for me because of a bad knee. It's either in the bed of the truck, or maybe outside in a box that disassemble and is moved back and forth into the back of the toyhauler on a dolly for use when we long time dry camp.
