So far they've worked great and I see no reason to expect that to change any time soon. Easy installation so I won't go into detail. It literally took about 30 minutes to install both. I will explain the pertinent details that make this product so great for my pickup truck. Factory settings, no load, I was 36.5 inches from floor to center of outside edge of rear wheel arches. When I put 420 pounds on the tongue, the pickup sat at 35 inches. With the SSR-610-40 SumoSprings installed, the unloaded height increased to 37 inches, which is an added benefit that I didn't expect and welcomed with open arms. When 420 pounds was put back on the hitch, the pickup sat at just 36.5 inches. This is exactly what I was looking for and has improved every aspect of towing my boat. And surprisingly, the unencumbered ride isn't overly harsh. The pickup has a stiffer off-load ride, but I wouldn't say it's rough or harsh at all. To be honest, I hardly notice it. I hope this helps other Tacoma owners decide if they are looking for a drag squat reduction product.
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