Rule 1.1 states...

1.1 Any standard[1] RC motor, wheel, chassis, or style is allowed
-Any motor (manufacturer, turn, or wind)
-Any wheel (slick, ribbed, nipple, etc.)
-Any style (buggy, Stadium Trucks (ST), Monster Trucks (MT), touring, etc.)

As long as its electric and 1/10th scale it can compete. Again this is to maximize a racers possibilites and strategies. A moster truck has the advantage of ground clearance, so to use my example from a previous post, the "bog" would be the better choice since the top-heaviness of the MT design might make driving the vertical loop difficult. I looked at it like this- each vehicle type has its own set of pluses and minuses. The challenge for the racer is to understand the strengths and weaknesses inherent in his vehicle and to race accordingly. The touring/rally cars are really going to have to keep clear of the bogs, but their handling should make navigating the obstacles (like the loop) much easier. Buggies and stadium trucks are viable standards, but even they will have their weaknesses in a well laid out track. That's what is great about putting all the vehicle types in one group, everyone has their own style and tastes. Some may say its rediculous to atempt to race a certain type of vehicle over another, but in the end it's the checkered flag that decides who was right and who was wrong.

-Pickman