F-150.5

Hi, I was looking into an F150(97-03) 4x4 and was interested in the 7700(7-lug) model. I like the idea of the heavier payload and towing w/o the weight and mpg of a super duty. I am just wondering about the hubs and brakes as 7- lug is an odd ball cofiguration. They usually have the 5.4 and 3.73's from what I've researched. The only person I've talked to who owned one said he got 20 mpg hwy, and had no major problems.
Thanks for your help.