can't begin to describe what a p.o.s. this thing is. 

Assembly is a nightmare - and I'm a guy that has tools and does lots of car work. 

The assembly instructions do not indicate the fact that the front rail is angled. I goofed and put it in upside down. The hex wrench they provide is far too long for the bolt slots on the inside of the frame to attach the arms so you can spend an afternoon making one minor turn at a time. You need a small socket wrench with a head that will fit in the slot and a hex head socket to fit inside the bolts or else you will be at this forever. Overall this thing is flimsy and absolutely not worth the near $700 I blew on it. Avoid it.