The 3500lbs rule isn’t universal. I can tow a 7,000 lbs trailer and rock-krawler with little sag and no control issues. Because my truck has a 3,000 lbs payload, long wheel base, and was engineered for that kind of weight. The wife’s SUV is rated to tow 7,200 lbs, but hooking that same trailer up to her rig would be a nightmare. Not even equalizers and sway control will make that safe.
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