Marcel van der pol
If I choose the option on this card to move up to 5 units from one system to the Rebel Base space (the base is not yet revealed) do I have to adhere by transport rules or could I move 5 ground units?
Cards which specifically allow you to move units will tell you which movement resctrictions to ignore. Only those restrictions are ignored and all other restrictions still apply. In this case, Rapid Mobilisation allows you to ignore adjacency restriction of movement but doesn't ignore other restrictions such as Transport Capacity.