I can only comment on the hitch as I have a pickup similar to yours. I have a Pullrite Superglide automatic slider and absolutely love it. Our pin box is the standard pin box from the factory.
Our dealer was really good and we got the hitch with installation for $500 if I recall correctly. I'm sure he made it up in the price of the 5er though, because that sure seems cheap. We were very close to doing the Sidewinder with a standard hitch for somewhere around the same price. Either would have been fine with me, but he recommended the Superglide so we went with his suggestion.
2012 Palomino Sabre 32BHTS
2008 GMC Sierra 2500 SLE 4x4 Duramax