If anyone is interested, ATW has developed these "Travel Discs". 495mm diameter with a 75mm wide foot. Steel construction with a canvas bag for each.....FUSO or Isuzu 6 stud wheel pattern. Zero offset.
The discs are designed to drop the height of a Fuso or Isuzu motorhome to allow shipping in a container. They may only be required on the rear axle as there is usually plenty of clearance above the truck cab roof even with raised suspension and 36' tyres. I'll post some more pics of one of our Global Warrior motorhomes backing up into a container to show clearances.
Most definitely interested, raised my roof a bit after you told me about these. Some time next year will pick up a set, way too many expenses right now.
As mentioned privately, best of luck with the new teaching job. I'm sure you'll do very well at it