For a mile and a half I wonder if you could almost take a piece out put it in the lap of one of your kids in the car, drive it over, and put it in the sump at the new place? It would be in the air for what, 10 minutes? Just tell the girls to hold it secure and drive fast! It might not be the most efficient way, but your SPS won't get all banged up against the side of a bucket...
Found this on RC, SPS at low tide:
My worry really is re setting the rocks ape. The corals are all getting pretty large and entertwined, no way to really set it up the same again. I think I'm going to take the opportunity to redo things with less rock, get rid of some nuisance at hung in the tank, majano,6 line shrimp killa... And the like. I may have an established place to store the coral. It'll make the move less stressful for sure!!! Bottom line is NEVER MOVE if you have an sps dominated tank. Lol