I logged alot of miles on the #100-#119 at Hinkle as well as we fielded alot of complaints about the ride quality with them as well. We replaced vert/lat shocks, monitored wheel wear and replaced a large quantity of those goofy air-cushioned seats (the iso cab fix must have taken place after I left). Before I left Hinkle, I went out for a lot of cab rides on both the Sandy and the Washy to see what was happening first-hand. I found out rather quickly that 50mph on the Sandy and 50mph on the Washy were not the same thing. You could easily drink a cup of coffee at 50mph on the Sandy while it was all I could do to simply stay in the center seat at the same speeds on the Washy.