I wentt truck camping twice and I have to say I hated both times. Once was a van type thing and it was so cramped it seemed to me like we were sleeping in the car.
The other time, it was a truck with a camper on the pickup part (there is a name for that but I cannot think of it right now).
But anyway, both seemed to ne a nuisance because whenever you went into town, you basically had to take your camp with you. I know it suits its purpose for some people and situations but I really didn't find it to be too much fun.
I sort of felt it was more work than a tent or other type of camper.