i had the +3. since i carry weight all the time in the bed. i was told these would be perfect for me. lasted 4 months and were done for. spring looked like a big ol w. had them re arched at deaver and 3 months later, same thing. i ended up buying a set from wsi (no longer a business. jimmy has a new company and doesnt do leuafs anymore) those lasted a bit longer. i finally had these re arched to add more lift and added a leaf. at last a solution........ been 4 years now and springs still look as if i just put them on there (arch wise) bit muddy, rusty and dirty, but they havent lost their arch yet. i found if you are going to get new leafs, OVER ESTIMATE what you carry instead of actual weight that you carry. i used actual numbers and they turned out to be not enough spring for me. might be a bit rougher on road, but at least you wont be removing, re arching and re installing over and over.
