Thank you for the comments TommyR
The rear suspension is based on a Hendrickson "R" model solid mount suspension.
http://www.hendrickson-intl.com/Truc...ional/R-Series
The truck was based off a Western Star 6900XD which has larger tires. Before I could find the tires I wanted these kinda grew on me and when it's loaded and off road the it'll stuff the tires. They also work very well off road. So I decided to leave well enough alone. At least for now,
