It is a bit heavy 60-70 to get up on the rails, so take it easy, maybe one end up at a time. Read the directions thoroughly at each step. Took a moment or two to make sense of what part or edge was being shown. Make sure left and right rail clamps are up snug under the rails at 10ft-lbs of torque (10 of force 1 foot out on your socket wrench handle, or 20 of force 6 out on a handle, if you think you know your own strength! I went for that firm feeling). After slipping the hold down bolts into the plastic slots under the front section of the cover, carefully align the front edge of the vinyl cover with the end of the rails at the front of the bed, as closely as possible (but knobs underneath slightly loose until perfect). I think that will help with overall alignment. There is supposed to be a 1/8 gap from the outside of the rail grooves. Knobs were very hard to tighten by hand, but I think I have them tight enough (bolt is tight going thru captured nut of the plastic knobs). If the cover or rails are not fitting right, do not force or modify, talk to BAK to see if numbers match or your specific issue. Went on our 2022 F-150 Lightning fairly easily as the parts fit well. Ford's bed has to be just right as well, so kudos to them.
Rating: [5 of 5 Stars!]