Hi, PML,
There are also oxygen concentrators that are not easily portable, but they plug in and do have wheels. They cost about $900 and there is no need to replace (very) expensive batteries.. In fact, I received an email a few days ago which had one on sale for $600.
For short trips I use my small portable concentrator, but for a month long stay out of state, I take the large one. The large one could be taken even for an overnight. It is rather heavy and awkward but the sites selling them will show the weight. If you don't travel, the large, less expensive one should be just fine.
Every concentrator I have owned sounds an alarm if the hose gets kinked or crushed. If it is too noisy for you, it can be put in another room using a long hose. I can't imagine any reason not to use one if it is recommended.
My best to your husband and you,
Sonnig