Monster truck are not meant to be used on a race because they are too big for a race. Also, these trucks can't be easily maneuvered and as we all know that we need to be good at maneuvering vehicles on a race since the road isn't straight at all. Even if you are in tip-tap shape, that won't guarantee that you can maneuver a truck so easily. Trucks can't be maneuvered easily since it is too big. Besides, accidents happen most of the time in a race and sponsors wouldn't not want to have a massive accident. For sure, the sponsors will be paying a lot of money for the accidents on a race if that happened.
Fortunately, in this game, you can maneuver your truck easily, so using a monster truck on a race is possible. The idea here is to get to the finish line as fast as you can. There are other competitors in the game and the race won't be easy. The secret to this game is not to hit anything as that will reduce your turbo time. You can get more turbo time by using something to get on air. You would earn money according to your position in the race. You can use the money to upgrade your truck