Rooftops, once setup, you cant go for a drive.
You can't just not far. Pull the two guy ropes, hook the ladder into the rope loops so its clear of the ground and move around the camp, dead easy!
Even when I tented I didn't roam far from camp in the car. I'm not a trusting soul and like to know where my gear is. A bloke I camped with had his keys stolen, which made it a bit inconvenient to get home, another had his whole camper go missing, which can also ruin your weekend.
I camp alone with kids and love my RTT, I can fold it out in less than 5 minutes, mattress is in there, sleeping bags and the beds are already made (just have to add pillows). Then I can get on with cooking and still keep an eye on the yard apes and making sure they don't fall off a cliff or drown or something, rather than have my head in a canvas bag sorting out somewhere to sleep before it gets dark.
That's the main reason I ditched the tents and went for a roof topper as I was doing it all myself because they were exploring. As a bonus everything seems to stay cleaner and drier as it isn't being dragged in and out of the tent flap and the kids shed the mud climbing the ladder, rather than wiping it off their feet in your bed
.
Packing up is around 10 minutes, but can be done in installments (lay the sleeping bags flat, go do something else, close the windows and zips, go do something else), actually folding the tent up and zipping on the cover is around a 5 minute job, but can be a bit of a bugger with icy fingers. A thin rope loop on the zipper and some silicone spray on the zip helps.