OK - so these are not for everyone. I'm running with a bed cover and a steel high clearance rear bumper with a swing out arm carrying a spare tire (35"). The stock leaf packs were flat if not bent backwards slightly while at rest. I only had 2-3" of travel in the rear. I also had a 4" block in the rear. I swapped in the Dobinsons leaf pack and a 32 " block. I'm up to about 5" of travel and the ride is great!