Why camp on your car rather than the ground?

One of the first advantages of going high up is to avoid all the insects and other creepy-crawlies that sometimes keep us company in a traditional tent. Or any other animal in general for that matter (hello campers who have been woken up by foxes, raccoons or even sometimes horses). Nothing very dangerous in our European regions... but it can become useful in countries with less "friendly" fauna.

Sleeping on high ground also avoids minor flooding on days of heavy rain.
Yes, the days when we dug our little trenches around the tents on the campsites are long gone. The soil must remain intact for the next ones (and in the end, that's good).
If you still remember that rock that prevented you from sleeping well last summer (the "camping" version of the story of the Princess and the Pea, in short), the advantage of sleeping on your roof is that you will sleep on a (really) flat floor.

Have you already mumbled "Oh, how low the earth is!" when getting up from your tent?
You don't think about it enough, but sleeping in a roof tent makes it easier to get up! Indeed, even though age can sometimes accentuate the effects of gravity on our bodies, with a roof tent, the height and the ladder lets you have a kind of bed edge to help the transition from lying down to standing up.

And for those who are still nurturing their inner child, sleeping in a roof tent is like the adult version of having the top bunk (or finally having your own "tree house").