Kenny transporting live rocks doesn't mean you have to place it in water. Live rocks are heavy as it is, use wet newspapers to cover the rocks. In two hours time with live rocks it should be ok. I ordered live rocks from across the world and that's how they ship it to me. It would be a good idea for you to use floor bracing due to the total weight of tank with live rocks, sand, canopy, stand, etc.. With a 240 gal tank fully up and running estimated weight would be over 3500 lbs. That's exactly like parking a semi truck inside your house.
Vin B.O.M "Blue Ocean Marines Inc."