What is a recommendation for an inverter? What size and a good brand.  mainly to run the TV and a CPAP.  I know the cpap amperage is widely variable, but just what others have used that works.  Where have you mounted the inverter? 

I have to use a Number bed at home because of 3 back operations. My number is 35 ( soft for dips of hips). I called Number Bed and they said to use 8" Memory foam that is flip able. I got it off Amazon, and laid on it once, and didn't hurt my back. I took the bottom bunk mattress and put it on top to the top rack. Wasn't cheep, but you have to be comfortable. Now draw back, cant lift the bed very high go get to storage. I like the idea of roll out drawer. use a stick to hold bed up while getting into the corners.

the truck may charge some, depends on the truck and the setup.  You do not want to rely on the truck to get your batteries to a full "state of charge".  You want the Pod plugged in to shore power to get the proper charge or a battery charger.  Are you running the fridge off of batteries while driving?  you dont want to do that. 

The switch is from Amazon

It does, thanks for the clarification.

I have a battery charger on them now, and after 30min went to full charge, left on 5 amp overnight. No, I plan on using gas for frig. from Charleston to Perry GA. ( 6hrs max) if I have to, then change over to shore power then go shoping while frig is getting cold. (GA fairgrounds, stores near) ,. I don't know how the charge is kept on the battery,(not that far in the book) but do have 2 solar units that I can run. (again haven't read that far) Still trying to basics like Twin bed, sheets, caulks, hoses with fittings. Got to two battery boxes and batteries ( gel type). Got a quick disconnect for the batteries, but not a switch that you are talking about. Again, can you tell me how to hook it up, if will find it on amazon. don't know how to get an email of a diagram? Thanks for your help. I figured out how to the Iball, and back up under hitch, now for how to back the trailer with the same unit. like I said first time, but this battery thing has thrown me.