I suggest revising current driving model, for example the AZU jeep accelerates and turns very sluggishly akin to a heavy truck, and driving uphill slows it significantly. On the other hand, the heavy Goliath truck seems to turn on a dime, even at high speeds.
Additionally, it seems certain vehicles - for example abovementioned AZU - change driving directions forcibly left and right off-axis. This seems to happen at random and is especially significant at lower speeds.