I would check Craigs list in the area's you are traveling in for a good used machine for a back up. I poke around on Portland's craigs list once in awhile and see cpap macines on there some are cheap and some are not. I take it you are a retired from Tualatin Valley Fire & Rescue? do you know Jeff Cooper of TVFR?
I thought that Craig's list (or was it ebay) stopped carrying medical advertisements? If not I am interested because I might be having an oxygen concentrator that I want to get rid of.
I just looked on Craigs List and there are 5 cpap machines for sale in the Portland area. I would test something like a cpap machine before I would by it. I emailed a guy about one of them as it is in my.
2013 Cougar High Country 299RKSHC
Elite 18k hitch, Sidewinder pinbox