Thanks for a very interesting discussion here. Just to add a few cents more, the details of R.P.O 341 Side Mounted Wheel Carrier are in Section 10 pages 3.00, 3.01, and 3.02.
Under the detail of the spacer on page 3.02 are the letters R.H. Does this mean the spacer goes on the Right Side of the truck? This would kind of make sense because at least on the 3100 series with the axle above the spring inserting a spacer between perch and spring will essentially lower the bed with respect to the ground.
