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

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Megamat Ultra and the Thermarest Neoloft are comparables. Def not ultralight but I use the Thermarest on backpacking trips, not thru-hikes, and love it. I'm a big guy and the Thermarest is comparable to my MondoKing and Exped MegaMat Duo. The Ultra will work well for you.
Thermarest MondoKing, and if too big for storage go Thermarest Neoloft.
I've used my thermarest Mondoking for YEARS. Even when I have a visitor they use it. It's expensive, but the best quality I've seen yet (I've gone through a few) it's so comfortable I look forward to camping and sleeping on it. Definitely not small, when deflated and rolled up it's the same size as my ten but 11/10 recommend for cozy comfy nights
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
Buying a nice 4 inch sleeping pad (I have a thermarest mondoking) five years ago was a game changer for me when it comes to car camping. I love that damn thing so much, I have no trouble sleeping on a traditional thin thermarest but the 4 inch one is straight up luxurious. It's not even in the same universe as a crappy walmart air mattress
Comfort being your only concern and posting something that is not light in an ultralight forum, I'd recommend the MondoKing 3d by Thermarest. XXL comes in at 5lbs, 8oz. 7.0 R value usable year round. [MondoKing™ 3D | Car Camping Sleeping Pads | Therm-a-Rest® – Cascade Designs](https://cascadedesigns.com/products/mondoking-3d-sleeping-pad) Neoloft is only about 2lbs. But what's the point going light if you can have more comfort. Time to rename this forum r/ultracomfort.
Exped and Thermarest MondKing. I have both, queen in the exped.
I did the same on a motorcycle trip. No mat in my 20s, thin minimalist air mattress in my 30s. Now, nothing less than a top quality Thermarest or Exped. I'd suggest hitting the stores, trying out the mats and buying a mat just a notch better than you need or go all in. Unless you are backpacking I'd go for the aforementioned's Mondoking or Megamat
Exped MegaMat or one of its clones (Big Agnes Captain Comfort, ALPS Outback Mat, Thermarest Mondoking 3D etc) Exped MegaMat Pillow or Nemo Filo Better quality tents from Marmot, Naturehike, Nemo etc. skip the Coleman and core stuff. Tent fan Lighting Flextail gear air pump

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