I have 11'+ behind the driver's bulkhead. 14'+ at ceiling height.
e57, I agree... I'm more concerned with security than visibility. I'm going to see what it takes to panel off the side windows and glass in the folding door. That should leave some nice room for advertising, and to hang an ext. ladder. The folding door sure is nice for casual tool access. I hope I can make it secure enough to keep.