I came across this C30 9 foot stepside for sale on the side of the road. An uncommon truck anyway, but the had a couple of SPID codes I hadn't seen before.
K43 - Poly-wrap air cleaner (I assume it's not the dyer hose induction system it's currently running)
Q20 - 6.00 x 2.00 Spare Wheel
Any examples of these options out there that are still in place?