what people mean is that A & D should steer the car, W should be acceleration and S brake. she and that's correct - dynamic shadows are a unity pro feature but if you are using the unity pro's trial (that is a limited 30 day trial) you can use shadows.
Awesome monster truck! In unity your flags aren't 2sided though. VROAAMMMM. This is a very very fun way to show off the model, I assume it's pretty easy to set something like that up in unity? And maybe make the tires less blue/greenish. :)