Has anyone have a set of these. I'm wondering how strong they are??? :confused: I want to mount a hi-lift jack (60 lbs or so). Is there enough room to drill and mount 2 - 1/2" bolts that are about 4"-6" long. I'm wanting to make it easily removable with the sliding tie-downs. If anyone has a single bar they don't use and want to sell one, e-mail me.