I have a few rotten boards on my wood deck trailer and was looking at how to replace them. Obviously the bolts I'll just undo but at each end of the trailer the boards ends are tucked under a 1-1/2 steel strap that runs across the trailer. The existing boards are 18 ft. (216 inches) long and the dimension between the steel straps is 213 inches. How do you get the boards under these straps? I can't imagine when Internation built it they dropped the planks in and welded the strap as there are no burn marks on the wood from welding. Does an 18 ft. board bow enough to get it in? Any ideas or tips are greatly appreciated.