I installed these on my 2011 Lexus GX460 which came with factory coil springs. I use it to stiffen up the suspension while towing my 5500-pound road trailer. Installation was a little confusing as the diagram in the instructions seemed to indicate that you should leave part of the original bumper in place. But the first time I cut it it was too long and the back of my GX was about 1 inch taller. I had to go back and cut the bumper completely. Inserting the bags into the rollers can also be a little tedious. You just have to work with them and edit one page at a time to get them. Besides, they work well. I have a hitch for weight distribution and only use bags to stiffen the rear suspension to avoid bouncing.
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