8-Lug Single Rear Steel Wheels V1.0.22

It's absolutely possible. Can't say I'm likely to do it, but you're more than welcome to use this mod as a base to make an add on for that, and post it. It's simple, I just don't have the drive to mess with this stuff now a days.

This wheels are bases on a 10-Lug pattern, and are not standardized by their hub. Porting them over would likely either be a fairly laborious or clunky process. It's possible, but i'm not really the man to ask for it to be done well.

There have been mod that have had this as a feature I believe, however they were tag along additions, and I personally cannot speak for their update history. This is just meant to be stand alone, and fully up to date. Not at all an original idea by myself.

Unless I were to make an entirely new tire model with less sidewall bow they simply don't fit.

I'm not entirely sure what you are trying to ask, but i'll do my best to help bring some understanding. The truck in the picture is simply meant to be a demonstration on the contents of the mod (showing off the 8 lug single steel rear wheels) and is not included in the form of a configuration for the D-Series in the mod for that reason. As for your tire issue the game by default includes a range for tires for 16x8 rims, and my mod supports all of them. These tires include: 225/75R16 Heavy Duty Rear Tires, 225/75R16 Standard Rear Tires, 31x12.50R16 Off-Road Rear Tires, 33x12.50R16 Off-Road Rear Tires, and 35x12.50R16 Off-Road Rear Tires.