if i was going to do a loin i would wrap it in bacon after putting a good rub on it,a loin is really lean & the fat amount in shoulders & such help keep them from drying out,that said a water smoker will dry the food out less.about 3-4 hrs cooking on inderect heat on a reg grill but running the temp up to 300-350 will turn out fairly good,if short on time a quick marinade in creolmolee sp? after slicing will turn out good,mike243