Get the following tools

Clear your trailer deck and surrounding area  make sure there are no obstacles in your way.

Place the flip bike chock on the trailer where you want it, checking to see f you are going to hit anything underneath the flip bike chock

Draw around the Flip Bike Chock with a marker, this will where you will cut the hole for the flip bike chock

After outlining the hole, proceed to drill four holes, placing one at each corner of the drawn outline.

Using a jigsaw, carefully follow the outlined shape and cut out the entire hole.

Using the grinder grind the edges of the hole and ensure the hole edges are smooth.

The flip bike chock is designed to fit tightly and you may need to give it a bit of a tap to put it in to the hole

You may need to repeat the process, until the bike chock is tightly in place.