Got around to doing my disconnect finally. I found a 12 volt battery gage and momentary switch combo at Cabella's ( under 30 bucks for a 2 battery set up ) It reads battery charge in 10 percent increments, is weather resistant, and the gage lights up when the switch is thrown. I also went overboard and ordered a waterproof battery disconnect switch ( 30 bucks but don't tell the wife ). I wired the gage according to the instructions, red to positive terminal and black to negative. The gage does not come on unless the switch is thrown. I looked at my 12 gage wire that goes to my converter and has a 25 amp fuse, and found my breakaway break switch spliced to the same wire upstream of the fuse. Not wanting to mess with my breakaway, I separated the two into two separate 12 gage wires. I left the breakaway wired directly to the positive side of the battery. I took the converter wire and isolated it with the disconnect switch. Now when I turn off the disconnect, it shuts off my converter, my LP and carbon monoxide sensor ( the big parasitic draw when not being used ) the 12 volt lights etc., anything run through the converter. I can still check the battery and raise the electric lift and work the breakaway breaks even if the switch is off as I saw those as necessary safety thing that I want to work even if I forgot the switch, and the gage as a convenience so I don't have to turn everything on to check my battery level. It took about two hours. I tested it this weekend camping and it seems to work good.
Thank you for your idea, parts list and description and for the courage to cut into my new ( only 4 trips on it ) camper. Off to the next mod