I bought these for my 2010 Pathfinder to help tow my 5200 lb trailer. The standard springs were too weak for such a load. I also installed new coil springs that raised the rear end about 1 inch and didn't compress as much. . Together with the compensating coupling, it can be pulled perfectly. Driving without a load is not too hard. If you're towing a lighter trailer, you probably don't need all of the stuff I've done. Took about 4 hours to install, I removed the coils to put them in.