My 2012 MB. Came with sumo springs installed on the rear by the previous owned. I can say it doesn't sways much at all. I've read posts that people who install them on the front remove them as they harden the ride. My toad is a 2001 Jeep TJ. Just over 3000 lbs. There are many around so finding a good one under $10 k is not to difficult.
__________________
|