Try to stick with Newer than '95, maybe even 2000, as already 20+ years old to those. Cab and Frame corrosion, engine parts obsoleting, trams and diff parts obsoleting, you ran into brake parts obsolescence on yours, Minn. Mags are fast becoming obsolete as are some versions of the old Budds and the hardware for them. IH Corporate drive Axles are pretty well an item of NLA, are a number of issues once pass 20 years and where technology has swapped to newer or Bigger Better Badder!!
Find a old Tandem, cut it down move rear to single drive rehab drive line to accommodate then align for sleeper or living quarters style sleeper and install a home spun bed box for tooling.
UT, WA, CA all not far and major metro regions where big machines do not move fast and prices align accordingly. CA pushing old trucks out past the borders, have to disappear or be scrapped as cannot drive them much by license regs.