They work great
I own a GMC Sierra 1500 and tow a 7'x12' 7000# gvw enclosed trailer full of shelves and carpentry tools. It is quite heavy. Before I installed the suppersprings the rear of my truck would settle down 2" when I coupled up the trailer. It took me about a 1hr to install in my driveway. I put the rollers on the hole closer to the spring. Now the rear of my tuck only settles about 5/8" to 3/4". Preloading the spring brought up the rear about 2" from stock, which I was looking for also.
2008 Silverado 1500 SuperSpring Review
I ordered these springs because I have a leveling kit installed on my truck, and I recently bought bumper hitch camper that made my truck squat/sag more than I liked. The install was fairly easy. I would definitely recommend lifting the truck from the frame when installing these. I lifted the truck from the rear axle, and it made the install more challenging. After installing the springs on the lowest preset, they raised the rear of my truck 3/4" and there was no squatting with the 5000lb camper
These performed exactly as advertised.
Quick and easy installation on my 2000 Chevy Astro LS AWD passenger van. The rear was squatting before the installation and I was hesitant to tow or load the back of the van with too much weight. Now, it sits about 1 1/2 to 2" higher in the rear and towing a trailer is much better. I also noticed that the van does not sway as much when making a heavy turn. Great product - works exactly as advertised. Thanks!