Pickups are excellent for towing campers or serving as a base for customising overlanding setups, but once they leave the factory

 the first important thing to think about is if there is enough room inside for you and potentially a companion to sleep down comfortably. 

This is challenging when it comes to pickup trucks, which are constrained by the bed of the truck taking up half (or more) of the vehicle's length.

the AT4X isn't one of those vehicles. Although the chairs may recline quite a little, I was unable to become cosy enough to rely on them for a restful night's sleep.

If you don't sleep spread out, you could be in luck if you're vertically challenged.

The Sierra 1500 is a broad truck, measuring approximately 7 feet in width. The width of the rear bench is 56 inches

 Although it would work in a situation, I wouldn't count on consistently getting a good night's sleep.

There is a pretty level floor underneath the folding bench that can provide a little bit extra length. 

Even though I'm only 63", it's still too little for me to lay down with the doors closed, yet it is much more comfortable than sleeping on the bench.

A inexpensive air mattress from Walmart or an inflatable sleeping pad like the Sea to Summit Ether Light XT 

The AT4X's bed looks to be the most sensible spot for sleeping. After all, there must be a reason why it is called the bed.

 if you have an inflatable mattress, however owing to the floor's ridges, a basic sleeping pad and bag won't work here. Additionally, there is room for improvement in the bed's length.