I did a tutorial right here on this site. That system would be built just the same way and code now is very fast and responsive. It should work very well on a vehicle. The latest code is up on that thread.
Me ill never have a system with out it at least not on something I had to rely on everyday. Systems with this set up and automation are nearly as reliable as running gasoline. If sure the larger WK units are more stable than our small scale systems. But it is very nice to never have to deal with manual mixing. Once you get running this mixer is very reliable.
Todd Harpster aided me in the later part of code development. This code now is very fast and responsive.
Your biggest challenge is not this controller, its the intimidation factor of it. Get the parts and build it. If you have trouble ask me Ill help you. $200.00 worth in parts, is not expensive for what this thing can do. Its actually quite an achievement at this cost. This thing is worth every penny and its now over 6 years developed.