Just subscribed. TwinStick Garage is a favorite of mine and is the Gold Standard for truck restoration on RU-vid. I have had an inspired idea just now. James Pretty is sitting on many nice trucks and they are for sale. Suppose you buy one or two and proceed to a teardown and overhaul on this channel. Done properly you can build a large viewership of subscribers. The magic is to create one video weekly and keep it no more than 30 minutes and keep it very real and engaging. You have the skills. Now, find the truck ( or perhaps a couple ) and get focused. His missus is just beginning a channel for the Marmon truck. Now, there is a project that could be one for a professional. Any Marmon really....
I would say you have a good maintenance program then. This truck suffered the cracks I think because the spring pins had worn out allowing the spring to ride directly on the hanger and in turn put more pressure on the frame.
I worked for a Kenworth dealership in the Pacific Northwest for 30 years, dealing mostly with logging trucks at I have never seen a frame crack like this.
It must be a Midwest problem, I also worked at a Kenworth dealership for 15 years in a bodyshop prior to where I am now and have fixed some real good ones there and have done a few here. Frames take a beating here in Illinois.
All of the Kenworths that I have fixed range from the early 90’s to the late 2000’s when Kenworth changed the spring hangers. As long as your rear spring hanger for the steer axle doesn’t have vertical bolts through the bottom flange you are in good shape.