Adam Lang has a good recipe for pork tenderloin in his cook book. His recipe calls for a brine, then rub and finishes with an apricot glaze. Indirect cook until internal temp is 145. Sorry I don't have the recipe here at the office.
Weber 22.5 WSM (2) UDS, Chargriller Acorn, Pit Barrel Cooker, Pitmaker Vault, Safe and Sniper on Trailer