The safest way to transport the tank would be to siphon at least 50% of the water (save this) from the water column, then take out rocks and either wrap with wet newspaper or submerge in water in a container (heavier option), bag fish/corals, and transport. The other option, which I have done many times successfully for small distances, is to drain at least 50% of water (save this), structure rocks securely on aquarium substrate so none can fall over, situate any corals securely, and transport. Other options include bucketing fish/corals and providing air through a battery powered air pump.