I got the hinge from Eastern Marine. This place has a lot of parts for custom trailers. They have a great website. Lucky me they are in my back yard and are tax free in Delaware. The have two widths 72'x3 and 72x2"
Trailer Parts Superstore - Steel Continuous Hinge, 72"L x 2"W and
Trailer Parts Superstore - Steel Continuous Hinge, 72"L x 3"W
Unfortunatly I do not have a break. I will either have to use the two by four method or have my local sheet metal supplier fabricate it. I am still up in the air. if i were to do it on my own. I would most likly skin the flat section on top. Then do the front sides with 45 degree break and spot weld to the top sheet. I have never done this so I have know Idea what the best method would be. If I have it done by a shop I would have them fab two sections of sheet metal with one seem down the middle or the longer length. I would have them put a 1 inch break along this length and rivet or weld the two sections together. This looks to be the appoach they took with the chaser above