You can add axles and tracks to the Suspension blocks at will, but our Trailer and Vehicle body blocks (whether 3DOF or 6DOF) do not allow the addition of tracks or axles in a flexible manner. We have 2 and 3 axle vehicle bodies, and 2 and 3 axle trailer bodies for both 3DOF and 6DOF cases. Presently we only offer only 2 track configuration for all vehicle and trailer bodies.
Starting in R2015b, the Vehicle Body block allows the two axles to have different numbers of wheels. If the Number of wheels per axle is set to a scalar, both axles will have the same number of wheels. If it is set to a two-element vector (e.g., [1 2]), the first element will be the number of wheels on the front axle, and the second number will be the number of wheels on the rear axle. Please see the block reference page of the Vehicle Body for more information:block reference page
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