CPAP machine

I bought a dc cord at radio shack years ago that had multiple female adapters of different sizes to plug into cpap. The other end had the male cigarette lighter plug that was quite long to allow me to run to car (this was for tent camping). And had another adapter with the female cig on one end and battery clips on the other, then just plug male and and female cig plugs together and attach to car battery or rv battery. Now, for the trailer, I have inverter mentioned by previous post. And yes, there are “camping CPAP’s” by Philips Respironics with rechargeable batteries that start at about $500 and then they’d likely need prescription from doctor, to much work. If there’s a will there’s a way. Good luck!