The sandbed is the trickiest part. I always say replace it and seed it with old, particularly if your rock is REALLY well established. I completely replaced the sanded in my 125 from my 75 when set up and saw no ammonia whatsoever with all my fish re introduced.
If you have the man power to move the tank with the sand bed still intact (suction cups, a crew, no stairs) I’d say keep it but depending on the age of it if you fully remove it you are going to stir up some funk that makes a metro waste plant smell like roses.
All other suggestions are great for transport. If you can get your hands on a battery powered air pump or better yet a battery backup to run some low wattage stuff to keep oxygen up, that helps tremendously as well.
Best of luck [emoji1360]