I wanna see some flat black dusters or rat rod dusters

Sireland is right about the buffer if you want it to be glossy, if you want the satin look, no need. Awsome looking truck by the way!
The roller job is labor intensive if you are going for gloss, if you compare it to a Mako or 10 footer, but even if you spray your own or let a cheepo-shop do it, you will need to wet-sand and polish it to really look good (got to knock down the orange peel at least). If you are getting a first-class professional job done, you wouldn'y really be considering a roller in the first place, would you?

Maybe I'm a little nutty, but I actually enjoyed spending the hours and hours wet-sanding mine (of course, it was in the high 70s, not 30* December). I also got a huge kick out of seeing the results unfold before my weary eyes.

Also, I've only tried black, but I've heard that the other colors are much easier to get good results from.