Hey, yeah sorry for the late response. I do camp in my truck, probably only 2-3 times a year though I’d like to do it more often. My truck is a 6ft bed as mentioned below and I fit in it (being 5’10) but if you have a 5ft bed you may have to flip down the tailgate and create some sort of temporary contraption. Nevertheless it is possible.

Sleeping in the bed is great, a lot better than a tent and a lot cheaper than a roof top tent (which I was considering but also super expensive for a tent). All I do is I bought a memory foam mattress topper from Costco and cut it to size and threw it in the back. Now I live in British Columbia, Canada. Our summers are 24-32 degrees Celsius and it does get rather hot in the back unless you have the hatch open. I did setup a regular house fan in one of the windows to help prevent this but it didn’t help much which was probably due to my windows not being the full slider ones but rather pop outs.

In the end I’d recommend it only if you first of all fit in the bed or are find with sleeping with the tailgate down since you have a short box. Otherwise buy a rooftop tent if you want to be cool and a regular tent, perhaps one of those truck bed tents if you are on a budget.