This will help some people, if you're having issues with crashes or missing wheels, try copying the prototype folder from the last version of Montana mod into the new version *do not replace anything except folders* then it might fix some issues. I did that because I noticed every time I tried to spawn an out of map unit, the game would crash probably due to a missing model. When I did that I also got the wheels on the Impala to work.
I'm sure that'll be fixed in the next update though.
Also, I LOVE the rural feel of this, I'm perfectly fine with the amount of hydrants. Coming from a rural town, this is really on the money.
P.S. I freaking love this mod to death, I can't thank Bama and his team enough. It's so beautiful.