Feedback noted, thank you for playing! The level is indeed a little hard for beginners, I'm going to work on a tutorial eventually.
I tried using the F + RMB command to make them drive on the road, but it didn't seem to work.
it's F + LMB
making my tanks target them either seems to do nothing sometimes, or makes them drive up really close before eventually starting to attack.
I dislike this too, it's because there's small changes in elevation that block LOS. The next map I make is going to be much flatter.