I got my son an 8 man tent with a divider in the middle of the tent.... Should I get him two thin air mattresses, or one thick big air mattress 4 him?

I ended up getting him two thick electric air mattresses that were on sale! Yay!!! He cannot drive a car up to date, he has never driven a car because he has epilepsy and has seizures quite often. He just turned 26 this week, he has two best friends that he can go camping with who do drive!