
Exped
MegaMat Series
Car camping comfort champ, but some side sleepers find it thin.
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I have 4 REI Camp Beds (2 qty 2.5s and 2 qty 3.0s). They are all close to 10 years old and still work with no leaks. I absolutely love them. They are phased out now, so this is really of no help. But I store them and my tents in my house (not garage or basement) as I believe that helps them last longer, fwiw.
Will be hard to find something at that price point, so might want to check for used gear or keep an eye out for discounts or sales. What I use/can recommend: 1. Zempire low profile cot with any sleeping pad on top (note: weight limit 220lbs) - nice, sturdy, nice to be flat and up off the ground 2. REI Camp 3.5 insulated sleeping pad, I think this was discontinued (mine is old) and the Camp Dreamer is the new model name, soft, self-inflating, thick/insulated 3. Thermarest Luxury Map insulated sleeping pad, soft and comfy, insulated, self-inflating Make sure you have a decent pillow or pillows. I just got the Klymit drift camping pillow and have been testing it out at home. It's amazing, feels like a real pillow, and I can't wait to use it at camp this year.
I have a REI Basecamp pad that was my bed for several years. It was just fine for my needs at the time. That pad is still in occasional use 10 years after I stopped using it as my permanent bed. Not sure how old it really is because I picked it up at REI's Scratch and Dent annual sale way back when. If you are having trouble with sleep systems at home or at camp might I suggest looking into a camping hammock. Typically that is my best nights sleep for me. I get out of bed with way less aches, pains and stiffness that occur when I am wake up on a regular mattress.
I went out this summer a few times with a very nice Nemo mummy bag and I discovered that as I've gotten older, I just can't get comfortable in a mummy anymore. Looking for some options, I stumbled on this zipperless bag from Sierra designs. It's heavy and bulky, definitely a car camping bag, but I took it out two weekends back in the Cascades for deer camp, with temps down to the 30s at night and it was the best sleep I've had in a tent in years. I paired it up with an REI camp bed pad for insulation, plus a bag liner just in case, and I am pleased to say I've found my new car camping set up. If you need space to squirm and stretch, or you're sick of fumbling with zippers, maybe consider one of these bad boys.
for car camping, i swear by the REI Camp Bed 3.5. it looks like it might not be available now. i slept on it for 3 months while we sleep trained our daughter, lol. it's comfy!
I liked the 3.5” REI mattress better than the exped mat, for some reason, you might want to check it out, too, as it’s considerably better priced. I use it on a Byers cot from LL Bean. I haven’t had to put anything under the legs. As a side sleeper, it’s important to adjust it correctly to prevent hip and shoulder pain. I inflate it fully (but not tight), turn on my side, then deflate it until either my hip or shoulder just starts to touch the ground/cot. It might work best to get 2 single mattresses so you can each have yours adjusted for your best comfort.

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