The problem is Realistic Weather, because the mod changes the vehicle physics. We don’t use it on our server and the grader works perfectly. I also coded the grader to work with the base game snow, not with all the options from mods that add snow or physic changes.
Ah understood. Do you plan to make it compatible with other mods or is it finished as far as you're concerned? I know you can't please everyone so I don't blame you if you aren't concerned with compatibility. Realistic weather is one of those must haves in my group so I'm just curious. If you're finished with it, may I have your permission to fix the issue?