I would like to make the distinction between "camping" and "hiking".

I consider camping to be whatever you can haul in with a truck, and hiking to be whatever you can hump in on your back.

With that said, I do a lot of hiking. But love to camp also.

If you are "camping". get the thickest, densest thing you can find. I've seen folks go out with four inch foam mat. pads. Do whatever you need to do to make her comfortable. A half dozen quilts, a few foam pads, an air mattres with a heater, ect. ect. Whatever it takes.

"hiking" on the other hand requires some ammount of sacrifice. I have one of those self-inflating pads that works very well for me. My wife seems OK with one untill it drops down into the twenties...Then she stays home.