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Not a must get. If you can get rig level with a good WD hitch, you really don't need them. Just got back from 4000 mile trip driving a 2015 1500 QC with 5.7 Hemi towing a 5500# 25' trailer. Did not have airlifts. No problems. WD was a Reese Dual Cam system. IMO one of the best for the price.