Ozz,
I face the same concerns. I have the stationary Movin-View and I am at 13' 4". Mounted approximately the same place. I had to turn around once on a back road and back track 50 miles due to a height restriction of 12' 10". Could not let enough air out of the tires. AHHHH.....all for Cindy's "Desperate Housewives and Grey's Anatomy"
oh...and my Travel channel!
Good luck and keep the head down!