Consider getting it aligned if you have not already. A good alignment saves tires.
As far as leaks are concerned, clean the bead on the rim to get all the corrosion off. I then paint the bead surface on the rim, then install the tire before the paint gets too hard. Keeps corrosion from reoccurring and seals the bead better. Bead sealer works, but not as well as the paint over time.
Randy, those Sailuns seem to work OK on my pickup, actually very impressed for the price. Time will tell for wearout, but the ratings are OK.