I have the Retrax pro... I would advise you to take a look at this cover as apposed to the roll n lock...the Retrax pro can be locked an any position allowing you to put something in the bed and then closing the top right up next to it and then locking it in...the roll n lock I believe only has 3 stops...plus the Retrax pro will hold up to 500lbs. on the top of it, not that I would do that but it shows you how strongly it is made the roll n lock is I believe rated for 200lbs??