I upgraded to equi flex equilizers in an effort to reduce chucking on my Montana 5er. They helped a bit, but I ended up upgrading to Reese Airborne pin box to totally eliminate chucking. My biggest issue with the suspension was the OEM installed leaf springs. The axles are rated at 6,000 lb each. Keystone chose to use 2,500 lb rated leaf springs. Axles can handle 12,000 lb but springs only 10,000. OEM springs sheared (by the shackle) on two different occasions causing much anxiety. Lucky we were able to limp to repair shop to replace. I've now installed 4 new 3,000 lb rated springs. Put about 4,000 miles on this setup with no issues.
02 Montana 3250RL upgraded a bunch
05 Ford F-250 6.0 Bullet Proofed