FYI this is only the third mod for any game I've ever made. And it is the first I have done my own mesh with, so there are some things I need to iron out. Criticism is welcome, but please don't be overly harsh.
So like with the other mod that you released. If you pay attention to how the 4 links are set up on Crawlers and Monster trucks they are more center of the axles and vehicles for the 4 wheel steering to properly work without the tires rubbing on the 4 link bars. The top bars are in the right position on the axles but on the vehicle both the top and bottom need to be moved more center of vehicle, also this is where stronger more durable sway bars come in handy, to help keep the vehicle from tipping side to side while turning, the bottom 4 links on the axles are too close to the hubs causing them to rub and collide, which creates some issues preventing the tires from being able to rotate.
(edit) Also may I suggest making a thread for this in Mod Support, that way I can take screenshots of what I'm talking about to show you the issues, and also we can better help you improve upon this mod, cause it's a really good concept, just needs some more ironing out.
I found a bug: The stock rear brakes don't work when using the regular 4 Link axle. Check your jbeams and make sure you don't have any duplicate parts. However, this mod is very high quality and gets 5 stars.