You are moving your horse when? A year and a half and already you are thinking up trouble. At this rate you should have ulcers long before the moving date. We can't know the future so try to stop fretting. He does need you to be his rock. A simple solution to your fear of his bolting is to use a lunge line with a stud chain on it and get him used to the feel of it. If there is a paddock or arena you can unload in then so much the better. Now, quit worrying, it will be fine. If you haven't been trailering him get some practise time in so that at least the trailer is familiar.