I have a TonnoPro on my 6.5'bed and a SuperGlide hitch. I've left it on a couple times while towing, but usually take it off because I'm concerned that there's not enough clearance with it on. I don't recall specific measurements but believe I have ~7" of clearance to the rails, and only ~4" on turns over the folded up TonnoPro. I'd like to leave it on when I tow but am concerned that a tight turn into/out of a steep drive (like at a gas station) might be a problem. I'll be watching this thread to see what others say, as I said I'd love to leave it on while towing...