There are a couple of scraps of information that I think could help with understanding the differences between a PHB and a WL, but one of the things I was hoping to see wasn't there (rates of axle roll steer vary between the PHB and the WL, and between an axle-mounted propeller WL and a chassis-mounted propeller WL mounted to a fabricated framework).
Roll moment variation, for one thing, probably needs to be discussed with an eye to rear spring rate and anti-squat %. Maybe that's further into the theoretical than the author wanted to go, but it's at least pertinent.
Getting closer, but I don't think fully solved yet either.
Norm