I have two 11#
propane tanks in my tongue box and have room for several miscellaneous items as well. With a little re-arranging, you could easily fit two batteries and a single 11# tank.
I also have a 2000 honda
generator as well, but never take it with me anymore since adding
solar to the roof. I only wish that I'd seen Norm's posts about "new
solar install" before buying my panels. The company that made his panels looked like they would make custom sized panels. Two long narrrow panels would have been perfect on the raised section of the
EggCamper roof.
Ron