Hello, I'm 8x8 and I have a few suggestions for Spintires: MudRunner which I think will make the game even better!
I think it would be better that you'd have to unlock upgrades, than just having everything from the start.
I think this would be the best way to do that:
To unlock upgrades like bull-bars and additional lights, maybe you'd have to deliver packages/containers to maybe warehouses,
as in the Spintires Intel Level Up 2011 demo, and for each package you get 2 store points and, say, a bull-bar costs 4 store points, so you'd have to deliver two packages to get it.
I think it would improve the game greatly if the vehicles were paintable. I've had this idea how you could unlock Paint Jobs:
There are multiple paint cans hidden in each map, and once you've collected it, you can choose that paint job when next visiting the garage.
Visually Realistic Winch:
In Spintires, the winch doesn't look realistic. It's a 2D sprite. Even in MudRunner, it hasn't changed. The MAZ-537 and MAZ-535 even have a great looking winch wound around the front bumper, but it just doesn't look good if a 2D sprite comes out of the winch points. I would be most grateful if they'd replace the 2D winch with a realistic 3D model.
AFV (Away From Vehicle) Mode:
I'd find it great if you could also exit the vehicles, and walk around the map, and maybe hop into/onto another players vehicle. If your UAZ is stuck on a hill, you'd also be able to push it. In order not to make 'scouting' (discovering watchpoints) very easy, you could just prevent the player to walk through bushes.
Please, please, please add macOS support for MudRunner. I understand that you haven't put it into Spintires, because you didn't reach the last kickstarter goal, but from all the money you have made from Spintires and, now, also from Spintires: MudRunner, I think you should really support macOS. Although I play Spintires, and, if I had MudRunner, I would also play that on macOS via Porting Kit, I think macOS support would be great for you because of enlarged community, and for the people who purchase it, who don't know of Porting Kit.
Hope you enjoyed reading this, and be sure to tell me your thoughts on what I've suggested!
Edit: Added three suggestions