Crap Rack
Assembly is very easy however that's the only nice thing. I only had this on top of my Jeep for 2 months before it started to rust at it's assembly points. The rust then leaked ontop of my jeep creating havoc on my paint. Will not recommend this unit. Spend the extra money and get something nicer.

Low Price Buys Low Quality
Pro: Fairly inexpensive. Cons: Not packaged well for shipping. Even though the box was received intact, the rack was bent in two places, and had a broken weld as well. It was shipped in two halves loosely in the box, without so much as a sheet of paper between them. Due to movement inside the box during shipping, the pieces scraped the paint off each other in several places, which will quickly rust without touch-up. One nut was missing. Maybe it would be good to buy in a store without the rough handling inherent to shipping.

The Correct size should be....37.5" x 47"
The price is pretty good and the build of the rack is well made (but will very small crack in paint if you look very carefully.)
I think the size they advertised on their package is wrong. I measured it a couple times it's more like 37.5"x47" then the 51" they advertised. I think it is not a problem from Amazon but a problem from the manufacture side. It's written 37.5x51 all over the package box but the rack itself after assembled it's 4" short. Despite the dimension error I am very happy with the rack.

roof rack
item was received quickly, was relatively easy to assemble, and to date has done it's job admirably.

cargo rack
extremely easy to assemble,instructions were adequate...I had this rack put together and on my suv in 15 min or less!!!!!