Keel boards
Ed K is right about that Gerry. He has sharper eyes than I have. I didn't even pick up on that. I've probably mentioned this before on the forum but when I set my new Long Mfg. boat trailer up, I sandwiched two pressure treated 2X10 planks and used power company lightning arrestor brackets to attach it to the cross members on the trailer. By securing the boards in this fashion, I got away without having to drill any holes in the cross members. The power companies sometimes throw these new brackets away if they intend to mount the hardware on the pole with just one bolt,nut and washer. These galvanized brackets are for cross arms only, and they come in kits for lightning arrestors, Urd Pot heads, and fused Cutouts. All that is really needed from the bracket is the galvanized strap and the two 3/8" carriage bolts,nuts, and washers. The strap has a long jagged slot on one end, and a hole on the other end. So they are pretty adjustable to fit any size cross arm. I bored the planks and countersunk a shallow hole with a Forstner bit, so my keel wouldn't hit the carriage bolt head. I attached the straps under each cross member to the two carriage bolts with the nuts, flat washers, and lock washers. I love bunk trailers, but sometimes the bow of my boat moves back from the bow roller on the winch stancheon a couple of inches when I pull her up the ramp. This is due to the angle of the trailer caused by incline of the ramp, and the boat floating on the water. My friend Wayne has come up with a solution to this problem by using a detachable hydraulic bottle jack with a boat roller attached to it, and placed under the bow of the boat on the trailer. I've seen it and it works. So as soon as he perfects it, I plan on stealing his idea in the same way that I stole his mast raising/lowering Gin Pole idea. Good Luck