generally speaking...no. the only time that you can accurately use RLA is under design conditions, which you rarely have...RLA stands for Rated Load Amps. if you are operating at the rating conditions then yes you can.
"Pimp My Service Truck"...that's a show I would watch!
Get me some rims and spinners, purple LED lights underneath, a disco ball and lasers....yeah!!! And make it a low rider!