I put “camping with oxygen cylinder” into Google & there are useful threads written by people with direct experience. (Some were American & less relevant.) Talk of rechargeable compression machines that take O2 out of the atmosphere, using O2 cylinders only as backup; the need for a sticker on the vehicle to alert emergency services etc.
But in short, it’s certainly do-able. I think one person was still wild camping in a tent.
We watched a mum of 2 smallish children put up a tent and set up, she had a portable oxygen set up on a trolley. She unhitched briefly now and then, but otherwise seemed to cope very well.
A day of all things motorhome and campervan. The show is held both in the main indoor arena and across the grounds. Catering, hot drinks and food options are available. Easy access to the site and free parking included. Win one of five pairs of day tickets