Have you ever seen a truck joining a race before?
Probably not since a truck is so massive that it would cause too much accidents. Those, who are seeing it live would be in danger since trucks are hard to control. That is the reason why, you would never see a truck joining a race. You might get an accident driving a car, but the damage that it would cause to you or other people are nothing compared to that of a truck. Even race car drivers would never use a truck to race. If you want to see a truck racing then forget about it since that would never happen unless it is just a video game. That is the only time that it can be done. Other than that, forget about it.
In this game, you can do that as you would be using a truck to participate in a race. The idea here is to get to the finish line as fast as you can. Grab as many coins as you can along the way since you can use it to buy some upgrades. Use your booster as you have them since you can't pick up another booster when it is full. The game would get even harder as you make some progress.