6' 4 1/2"
When you think about it, I'm not that tall. I am the 2nd tallest of my family, but it's an italian family, so if anyone breaks 6' it's a surprise. My great uncle beats me hightwise though. 60 years old, 6'9" and a size 15 shoe. I beat him with shoe size though. 17's.
The limo would work, More room to work with. A "hummer", like an H2, which I dont consider a Hummer, is a large coffin on wheels. Not enough room, to much is taken up by unneeded crap.
If it doesn't have the Gun locks still on it, it's not a real hummer.