Roller system makes it easy to push a ladder up onto crossbar unassisted! Safely carries long ladders weighing up to 250 lbs. (evenly distributed) Fits any generally flat canopy over 52" long 5" high rails prevents loads from sliding off Another great idea from U.S. Rack, Roller Rack makes unassisted loading of ladders a snap! Consists of 2 sections that mount on one side of truck bed. One section has a roller that lets you push a ladder easily up onto the crossbar. Crossbar pivots allowing you to place end of ladder on the other crossbar. When loaded, ladder can be locked in place with pins or padlock (not included)no need for ropes or straps! Rack frame can be mounted on feet or removed in minutes. Feet bolt to roof canopy with some drilling required. Rubber gaskets prevent water leakage into interior. Constructed of heavy-duty steel with gloss black powder coat; includes stainless steel roller and hardware. Manufacturer's limited 1-year warranty.