Good luck with that 7' limitation! I suffer from the same thing, hence why I won't be getting a rack until we relocate in about 18 months and no longer have a garage built by Hobbits. I had a 15' high garage with 10x10 doors put in to house our RAM, trailer and Sequoia. The Sequoia is gone, but I don't feel like shunning the Cruiser to the toy box just yet. HA!
Sadly I kept a couple locks on mine any time we were out. They're more likely to grow legs in a grocery store parking lot in a "nice" area full of mall crawlers than typical "bad" areas where folks wouldn't even know what to do with them.