
Exped
MegaMat Series
Car camping comfort champ, but some side sleepers find it thin.

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I've used a 3P and a 4p with my bf. It was the perfect size for me in my msr elixer 3. My bf and I got the sea to summit version in a double for both of us to use and it had leaks within the first two weeks so I'm a big fan of how well my thermarest has been holding up
Exped MegaMat 15 or one of its clones (Sea To Summit Comfort Deluxe, Big Agnes Captain Comfort, Nemo Roamer 3D, ALPS Outback Mat etc). Well worth the money. You will want to get an air pump for this. For the Exped mats the Megapump is totally worth it.
A non-insulated blowup air mattress like you buy at Walmart will be much colder than the ones designed for camping. Exped and Thermarest both make great home mattress-like pads. I have a Sea to Summit Deluxe and it's wonderful - I bought it over an Exped/Thermarest because it comes with a lifetime warranty.
Since weight isn’t a concern and you’re staying in one place, comfort should absolutely come first. The Exped Megamat LXW is kind of the gold standard for plushness — it’s wide, super supportive, and feels almost like a real mattress. It’s bulky, but since you’re not carrying it, that doesn’t matter much. The Sea to Summit Comfort Deluxe is also great, but the shorter length might be annoying at your height. Your feet will probably hang off a bit unless you sleep curled up. The Comfort Plus 8cm version is nice too, but it’s more of a premium backpacking pad, not a “sleep like home” pad. If you want to sleep well all week, go with the Exped. You’ll wake up rested and not sore, which matters a lot for long ski days. The S2S pads are decent backup options, but you’ll probably end up wishing you went for the thicker, wider Exped after the second night.
Look for an insulated inflatable mat, or a self-inflating one. I love my Sea to Summit self inflating mat. If he’s car camping, a pie iron is a very versatile option for cooking over the campfire.
I have a sea to summit self inflator. Used it for two seasons still good so far. Was quite warm when the ground was cold and never had a problem with it leaking. When it first comes out of the pack you may have to pump it up a bit by hand but when the foam finally settles and stretches it works good Edit: I did get the regular square size and it folds up pretty small as wel. I've used it out of planting also for backcountry camping and it works great, is not too heavy either.
Maybe you could get an electric air pump with a blow and suck function. I guess I never had to take it on a plane so I just used my body weight to shrink it down. Open the valve, fold in half, and roll up starting from the opposite end of the valve with my knees on it as I rolled it up.

Exped
MegaMat Series
Car camping comfort champ, but some side sleepers find it thin.

Exped
Ultra Series
Lightweight side-sleeper comfort, but a bit pricey and bulky.

NEMO
Tensor Series
Ultralight side-sleeper comfort, but slippery and prone to leaks.

Big Agnes
Rapide SL Insulated Sleeping Pad
Comfortable with side rails, but heavy and warmth claims disputed.

Therm-a-Rest
NeoLoft™ Sleeping Pad
Very comfortable, good service, but heavy and bulky for backpacking.

Ranked #1
Exped - MegaMat Series

Ranked #1
Exped - MegaMat Series

Ranked #1
Exped - MegaMat Series

Ranked #1
Exped - MegaMat Series

Ranked #1
Therm-a-Rest - NeoAir Xtherm Series