My springs are getting tired. All four ends of the upper secondaries engage the stable loads at different times together. The best, if expensive solution is to buy a complete set of aftermarket springs that are made to be completely compatible as a unit. DJ has them. I have made it a hobby to work over my spring packs adding leaves and overload capacity with varying results. Except for the complete replacement set, add-ons are really a crap-shoot. They do not take into account the current condition of your spring packs or the actual load you will carry. Recently I added a thick, 3" lift spring to each pack. I do like the ride better and with the TC on I got 2" of lift, but the Stable Loads are now too far away from the secondaries to do any good except at that tiny apex when I'm at the max load with the camper (read: 3 completely full tanks; not a place i enjoy). So, now I must add some height to the Stable loads to make them engage sooner: a work in progress to be sure.
jefe