Firstly, I was almost entirely inspired by ErikSW's old Gavril Wheeliepickup 5200 hp, recently brought back into the limelight (albeit without attribution) by krod1988. Those mods are based on a very old version of the D-Series. I couldn't find anything to diff the mod against and some parts of the truck seemed to be a real mess. In the end I started from scratch. Later I found out that ErikSW was the original author (kudos!), but that doesn't make either mod less hideously broken in v0.5, which leads us to... What I ended up! Which was a handful of parts and a proper selectable configuration for the D15 and Roamer. The parts are BeamNG.drive v0.5 compatible and (as far as currently possible) work with the D15, D35, Roamer, etc. The "extended" chassis seems to have it's own suspension (maybe it doesn't use offsets yet?) and therefore does not get to take advantage of heavier-duty shafts for now. Despite this it can be setup to lift the front wheels at least while being a bit fragile. 3 engine tuning levels added: Infinity, Infinity*Infinity, and 9k RPM. They bounce around somewhere between 5k horsepower and 7k horsepower I think. 2 sets of extra-sticky low-profile rear tires. One set good for around 270mph and the other is good for a bit more. The Triple-Z rated ones are slightly stickier and have tougher sidewalls. 2 different "rear suspension" components: HD and Ultra Duty. Both sets only modify the driveline components: axles and driveshafts. HD isn't really done and is meant to be more fragile. Ultra duty should rarely break. 1 configuration each for the Roamer and D15 Pickup, found in the same area as other normal configurations such as "Offroad" and "Sport". Of course that's where I recommend starting. Take a look at that configuration, play around with swapping parts, and then maybe move on to interesting things like 4WD vehicles or the Extended chassis D-Series. I first posted r02 in krod1988's thread here in post #9. At that point my mod was a real mess of files, filenames, part names, etc. I've cleaned everything up considerably - all of those things are now at least decent. Since r04 it's capable of big wheelies, burn outs, destroying parts, and flipping onto it's back like a some extremely fast turtle. Maybe eventually it will be able to do standing backflips?