Dont Use Latex!!!!!
I painted my 63 VW "Bus"and my 63 VW Beetle I had with a brush and roller,with Rustoleum when I was 16,and had no cash to do it right!--I wanted to at least preserve the metal from rotting any further,until I could get a "real" paint job someday (which never happened of course!

)...two tone red and white,it looked pretty good considering..

--the Beetle never got beyond the Red Oxide primer though..
My 1956 Chevy 3100 pickup was painted gloss black with Rustoleum by the former owner--he used a roller,and wet sanded and buffed it out with rubbing compound a few months later to remove the orange peel --it actually looked pretty good!..It holds up well to weather,and is easy to touch up if it gets chipped...
One word of advice--DONT USE LATEX PAINT!!..it chalks up bad,rubs off on clothes,and wont hold up on metal long--doesn't protect against rust very well either...I'd stick with Rustoleum,or some similar oil based enamel,like Porch and Deck paint..all enamels (that dont use a hardener)are fairly "soft" paints,and will scratch up easily when branches rub up against the truck--they buff out readily,but you lose some paint every time you do it..but I doubt this is of much concern to those who are thrashing the truck off road...
My theory is ANY paint is better than rust!..I'd rather have to strip house paint off an old vehicle,and have a rust free body underneath,
than have to weld it back together with patches !!.
