The first step when trailering your boat is to take the mast down. When lowering the mast, be sure to watch out for overhead wires. Once the boat is on the trailer, be sure all the tie-downs are tight and secure and free from signs of chafing or rot. If these signs are present, the tie-downs should be replaced.
Since different trailer manufacturers will have different requirements for their trailers, the best advice is to follow the directions given to you by your dealer or trailer manufacturer. State laws concerning trailers vary from state to state, so be sure you are in compliance with the laws of your state and other states you plan to visit with your boat.