We use the homemade chocks also. We use 2 on each rear tire, have a rope that connects them so it is an easy pull. We also have wood "structures" for under each landing jack and stabilizer, always use them. I put handles on these so they are easy to pick up. Also carry 2 1/2 2x12s in the truck bed in case we need to level, which isn't very often.
I thought chocks were to protect against the potential rolling of a trailer. I don't see how the Ulta Fab and others like them protect against that. I must be missing something.