The brake pads from Performance Friction for the 4-wheel disk brake Chevrolet P30/P32 (JF9 brake option) chassis are good performers. They definitely haul our 13+K pound RV down quickly. Have had to make a few panic stops, and these pads have never failed.
They do produce a fair amount of carbon black on the wheels, and occasionally make some noise, but I feel the trade off for better stopping performance is good.