Looks like they serve the purpose of beefing up the rear end enough to tow a travel trailer. Have hooked the trailer up and improved the ride height considerably. Haven't taken the trailer on the highway yet. Definately noticable ride difference with and without, rides more like a truck than a car now. Truck rated at 9400 lbs but springs were sagging with trailer hitches to the truck before. Truck more level with trailer hitched than before.
Excellent passive suspension upgrade. Virtually eliminated sway with heavy loads when cornering. Tires will give long before the suspension will sag. A must for any heavy loads.
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