On a 3600 you could have an offset of 7/16 on a 17" wheel or 3800 with the same offset both being SRW. But the 3800 DRW that had 18" had an offset of 4-9/16" with a DRW front hub. the axle length was the same , bearing position the same, The DRW just has the hub extended. If you look at the alignment section of the manual it shows the kingpin sitting at the inner edge of the wheel about 3" from the wheel centerline. You just can't have that much pin inclination and still drive it. Does it actually incline into the tread area , yes, That's the scrub area and it only changes that slightly. you can get a larger change for swapping to late model wheels.
