if a small shop with slow pulling ex fan i would and have done .just paint the roof .first set the body as low is you can i set the axles on the foor on 4by 4 s or 2by4s tap under the drip rail drop a plastic paint cover over the body to keep over spray off the rest of the body drape paper on the top of the drip rail over your body bag .this helps hold down the body bag .keeps paint from sticking back on fresh paint as the paint will stick to the paper and if you use just the body bag the paint can flake off and stick back on the fresh paint. tape body bag down good . start from the farthest part form your ex fan . after done with the roof. final sand the body sides when good and dry tape off the roof and paint the side .if good fan with good pull and you want a work out you can shoot the hole truck .i would start by putting on the first coats on the roof and i would lay two coats down spray the side till your up to your last coat go back hit the roof wet it out then wet the tops of the side upper side keeping every thing wet and work down if you do it this way you still may have some fall back and have a dry roof painting the roof and taping it off makes for the best wet job in a small shop . but first on any paint job i cut in under wheel wells lips rockers all hard spots .if you drop it on the floor you can cut this in first and when dry scuff with a gray 3m pad and finel sand the body with wet 400or if gold back 3m go to 600 if you blow paint out on the body you will see it so it needs to be good and flat so wet sand it out