I have been trying to find the thread that had the details of the home made x chocks that go between the two wheels, as I want to knock up a set. Needless to say either I cannot work the search function or it cannot find the one that I am looking for.
Anyway my question is what angle are people cutting the 4x4 at some places I have read 45 degs others 20 degs - what works best ?
I would take the board you are using to make the chocks and hold it against your tire about one third down and mark the angle. Use that piece to mark the other three boards. That will allow the boards to match your tires.
I held a large piece of cardboard behind the tires and traced the pattern of the tires onto in. Then I laid the 4x4 pieces over the tracings so the wide end of the "V" block would remain it's original width then marked the narrow end according to my tracing.