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My original and still current machine is a Resmed S9. I do like the machine and nothing is wrong with it. But camping has always been an issue, I just don't bring it with me and then regret going camping because of my energy levels. Since searching and asking some questions on here recently on camping with CPAP options. It seems with the Poweradd Pilot Pro and 24V converter, 2 nights is the max one can get. I'd rather not have to carry the S9's power brick along with the converter to just get 2 nights of use.

So this brings me to my question. If I can get my insurance to approve a new machine, which one would people suggest? I've read about the different companies having different algorithms, which does give me a bit of a concern on switching. But I'm only going to be using the new machine for camping. I've read good things about the Respironics' line, so right now I'm leaning towards them. But I wouldn't be surprised if the DME tried pushing the new S10 on me, since I've been on the S9 for so long. And my paranoid mind doesn't want to bring up camping as the reason for the new machine and have them laugh me out of the office saying that's not a reason for a new machine.

Anyways, any thoughts and opinions would be greatly appreciated.

Thanks.

Because of the 12V issue, the PR machines will do nicely especially since you don't use the heated humidifier.
I would go with the"It's over 5 years old" argument and never mention camping at all.

Car camping or backpacking?

If car camping, maybe you could use (cheap) lead-acid batteries and the ResMed 12V adaptor with your current machine? That should get you enough capacity for multiple days. This thread tells of my experiences using AGM batteries to power a Transcend machine.

My suggestion is to experiment at home before the trip - try your battery configuration and see how well it works at your bedside.

(According to ResMed's battery guide, the S9 is a strikingly efficient machine, drawing only .4-1 amp at 12VDC, assuming you use a standard hose, no humidifier, and the 12VDC adaptor rather than an inverter + 120VAC adaptor. The newerAirsense 10 draws .7-1.66 amps.)