Bulky (X) Models with the Bulky (X) Special Rule take up more space on Transport Models."
A Model with the Bulky (X) Special Rule does not use up 1 Point of Transport Capacity when it Embarks on a Model with the Transport Sub-Type. Instead it uses up a number of points of Transport Capacity equal to the value of X attached to eh variant of the Bulky (X) possessed by that Model.
Slow and Purposeful "Models with this Special Rule cannot Pursue fleeing enemy Units."
In Step 4 of the Resolution Sub-Phase, a Player that has won Combat cannot choose for a Unit that includes any Models with this Special Rule to Pursue, and must instead select another eligible option for that Unit.