I have two double air mattresses, one is like a pocket coil., Coleman
..Its sucks in the truck, it bows up in the middle and is almost impossible to sleep on becasue of that.
The other one is like tubes that run the lengthways of the mattress, it shapes around the wheel wells really good and does not bow up in the middle.
It was $15 Canadianat Walmart its a Ozark Trail mattress.
There are made for truck ones that have the wheel wells cut out, but they are expensive as h$ll