I posted this under the Chevrolet Silverado but it is worth a post of its own. How to add back wheel steering to any truck or car within Spin Tires. Easy really just open the corresponding xml file. Usually there are a couple of sections at the bottom which look like this:
Usually the front wheels will have "Steer="1.0" and the back wheels have "Steer="0.0" like the example above. If you want the back wheels to steer opposite to the front wheels change the Steer value to "-1.0" or if you want to able to move the car like a crab change it to "1.0" For some cars this does look "natural", for example the Chevrolet Silverado and Suzuki Samurai. The Maz-537 not so much but it stil nice to be able to do tight corners with a beast that big 😉
Bardaff mentions in his post the following about the value you can change for the rear wheels. Nice bit of extra info!
You'll notice that the value of -1 for rear is quite too big on cars (it's usally more -0,25/-0,35). Yes, it's not only 0/1 value (also useful when having multi steering vehicles like the maz, the second axle turns less than the first!)