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

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Thermarest Trail ProLite. Was not difficult. Just cut it about two foam cells longer than you ultimately want it to be. Then you have to get the foam out and any residual foam bits with alcohol or something. Lay it flat with no wrinkles and iron it shut and then you can cut the residual down to the desired length being careful to not cut through the part that is ironed flat and creating the seal.
We just bought new pads this summer for sea kayaking. Space in our boats was an issue so we found a Thermorest model that folds in half before rolling. If space matters this will help. Thermarest Trail Pro Max. As I recall they about 2.5 inches. Maybe 3. Very nice surface and quiet to sleep on. The really cool bit of kit is an electric inflator I bought for packrafting by Flextail. It’s a small rechargeable 4.5 kpa pump that will inflate a mattress in a few seconds. It also has a light and you can even plug your phone in to the battery to charge if you need to.
Still on a Thermarest TrailPro and the Nemo Fillo Pillow and haven’t had any complaints. I also have a Big Agnes Rapide which is thicker but takes longer to blow up vs the Thermarest.
If you don't mind me asking are you a larger person? I'm around 270 and a side sleeper and have been curious about getting a different sleeping pad. I've been using the Thermarest Trail Pro and it's pretty comfortable, but it doesn't pack down very small
We use two square thermarests connected together with a sort of fitted sheet that thermarest sells for that purpose (synargy sheet I think) if we are car camping the mundokings are incredibly comfortable. If back country camping then a more package one like the trail pro. Then we use a quilt instead of sleeping bags unless it’s getting down below 5c or so at night. A good sleeping pad and a sheet and quilt instead of a bag goes a long way.
As a scoutmaster, a lot of my scouts show up with similar or slightly worse gear than what you're describing and they survive those temps (and lower) without complaining too much. We bring extra sleep pads and warmer bags with us in the troop trailer as back ups and let them know that they're up for grabs if they need them, but they rarely ever do. Assuming you're car camping, I'd at least pick up an extra pad, even one of the cheap blue ones from Walmart and add it to the one you have. Then just bring a couple extra blankets or consider a sleeping bag liner. Throw in a few hand/feet warmers just in case. My personal gear is a blue Walmart pad, insulated Thermarest Trail Pro mattress, and then a 30 degree Coleman bag with blankets or fleece sleeping bag liner as necessary. Even below freezing I usually get too hot with the liner.

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