sunfish trailer bunks

can some of you folks tell me what the distance apart of bunks on a trailer should be from center of one bunk to the other? I am planning on some long distance towing and want to make sure the hull is comfortable.
Thanks

There are a couple of schools of thought on this. One says that you should always trailer your Sunfish upside down to prevent damage to the hull. The other says that trailering right side up is fine so long as the stresses are carried on the sides of the hull and not on the bottom. I trailer right side up. I built bunks that conform to the shape of the hull which support the boat right along the hull edges.