When I had mine I had it about 1/2” away from the cab. I loosened it up, adjusted “depth” then crawled in and had my wife align tailgate and so it sat evenly left to right and hold it there while I tightened it down. That put the tailgate just under the tonneau. It was a “just barely fit” kinda cover and having the extra hands was the only way I could get it to align nicely.