I use a CPAP and don't use it while we're camping,but have found that even though I have lost 30#, I am still over the DOT sleep apnea line for not using it.. Oh, and they will ask for your smart card when you get your physical.
I am trying to decide if I want to spend the extra money for a 12V adapter for my new one and wire in a 12V plug off of the radio in the bedroom or just run the inverter all nite. Even tho I am on the line,my CPAP helps me get to sleep better.