I mainly move heavy loads, dump trailers, low bed trailers and gooseneck semi-trailers. When driving over bumps, the truck bounced and jerked. I have a rear HD spring with helpers and new shock absorbers, the truck didn't sag, it sat almost exactly. My son put a timbre on his truck because of the sag and said try them they will help. It was straight on a trip to North Carolina with 21,000lb GVW, the rebound is gone and the car drives fine when empty. worth your money. Timbren DR3500CA suspension enhancement system
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