About the hub centric thing, I would just call a few shops that sell these rims and ask them which ones have the bigger opening. They should be able to tell you which ones can be used with Toyotas, Nissans and Isuzus and which ones are for GM Trucks. From the link you posted, it looks similar to the way American Racing has their wheels listed. There are two sets of Chambers in 16x8, 0, 6x5.5, one for GM Trucks and one for the rest. You do not want the ones for GM Trucks, which I THINK, are the hub centric ones, but I could be wrong, you need to call and talk to some shops...they should have the answers you seek.

Bart