While I completely believe that Yoshi has done his homework with his cars, it doesn't mean that his cars are the only cars out that are setup correctly and work. To tell you the truth (other than his older prototype car) I haven't even seen one drive yet, so I have nothing to go off of other than his posts on GD and DDR.
Like I said, talk to Larry Short and he could probably go into all the same details about wheel travel and how his cars are setup.
No offense Yoshi and I don't mean to talk crap at all about you or your cars, but all I know is that my rail handles EXTREMELY well and sure feels like 18 inches of rear travel. I know for a fact that as hard as I have ever G'd out this or my last car, the frame has never bottomed out. The sprocket has barely brushed the sand, but thats about it. This car is setup damn well in my opinion.