I'm always interested to hear what folks use for car camping. Tent, camp furniture, stoves, and especially sleeping gear. The only cot I've ever considered buying, was the combo tent & cot.
I thought it would be good for my overnight trips, where sleeping out of the elements was my only concern. Quick setup and take down, but lacks any living space.
Anyway, a traditional cot just doesn't seem that comfortable to me, but I have trouble sleeping on anything but my own bed. This is my current car camping setup. It's more comfortable than most motel beds, and portable.
Cabelas Deluxe Camp Bed, memory foam, and 20 degree, Coleman, oversized bag.
briansII