I'll check mine tomorrow, but depending on how far back you have the front seat and at what height you fit it, you'll have just over 6 feet.
I've been debating this in my head for years without result (unless you count NOT buying a roof tent as a result!) I don't like the weight on the roof, wind resistance, opportunities for falling out inebriate, sensation of a small ship in a gale on windy nights, time spent putting up (despite what their fans say, it's still quicker and easier to put up a ground tent unless you go for a pop-up Maggiolina style one - HOW much money??) How many people have been dragged out of their ground tent by a hungry lion? And if the lion's hungry, it's just going to scratch your bonnet before tucking in anyway. The end result will be the same!
Having been horrified by the price of the popups, the only advantage they have is your bed is completely made and ready to fall into (out of too). They take up a lot of space, but what else are you putting up there? Jerrycans? Aaargh, more weight, fuel dripping on the windscreen... Spend some money with someone like me and get some basic auxillary tanks under the floor (any sheet metal worker can make up a tank to your cardboard model design, and for a lot less than some expedition outfitters like to charge)
Hmm. That reply was longer than I intendedWhat it comes down to is: Do you carry a lot of tat? Are you large? Is there more than one of you? Answering yes to more than one of those would indicate sleeping inside the 110 might not be the best option!
Would be interested to hear from people with genuinely positive comments on rooftents, other than trying to justify having bought one, and the heavy rack to carry it, and spent all that money on fuel to push it though the air, and had to avoid a really nice bushcamp for fear of capsizing the rig.
Think I've convinced myself anyway!