To the folks that have the panel-type tonneau covers, such as FOLD-A-COVER, and BAKFLIP - Do they stay in place when horizontally stacked up (open) at the front end of the bed and you are towing ? I also want a hard cover, and I'm having an aux fuel tank installed in the bed. I don't believe any of the retractibles will work as the height of the aux fuel tank is too high (but is below the bed rails). I don't think I want to travel with the panels in the vertically stacked configuration as shown in some of the manufacturer videos I've looked at.