They are Sterlings. A bit fancier, more "Psuedo" Chrome......couldn't get a ground on either antenna mount (both are on the back of the cab), finally got the c/b mount working right, but still haven't been able to get a ground on the am/fm. It does seem to pull a bit better, at least in the top two gears (10 & 9)......once you have to get down lower than 8 however, it is about the same as the '06 model with the Detroit. It does ride smoother, and is quieter than the older ones, overall, I like it. The radio hookups are not powered in the ACC setting on the key switch, therefore, whenever you turn the key off, for any reason, you loose all of your radio settings, that is a bit annoying. It really handles well, especially in a crosswind, also, the smaller tires, makes it way more maneuverable, when hooking/unhooking, smaller turning radius.