The Tear Jerk Journal - Bolting Down The Floor

Well kids, it looks like The Tear Jerk Journal was somewhat of a fitting name because this project is already jerking some tears of frustration out of me. I am only on the first part of the build and I am already stuck. I guess that's what I get for buying a 4x8 trailer from Cletus down at Tractor Supply. To explain the problem simply, those hillbilly's expect you to put a round "peg" into a triangular "hole" as seen in the following picture.