Yeah, those truck tents are pretty sweet. We introduced them at CT maybe 2 years ago and they've been very popular. Like Fob, if I HAD to camp, being up off the ground is a bonus, and i agree that you could move the truck around the campsite without having to take the tent down....but on the road, no way. Great for festivals/events too....seeing lots of these pop up in the campgrounds at CTMP, etc.
Course, if you're sleeping 'in' the truck, why not just save the hassle and sleep in the cab
The only time I've gone camping, back in university, I ended up sleeping in the cab of my Sonoma....Way more comfy than some sketchy tent.