One thing that has not been mentioned is the
Andersen levelers They are a little expensive, but work great and have chocks as part of the system.
so much easier to use than either plastic or wood blocks, because you don't have to try to guess how many you need and back up and pull forward onto the blocks so many times.
I combine them with a
giant level and I am level quickly and only have to get out of the truck one time to set the levelers under tires, then once I am level, I put chocks under the levelers and rubber chock around tires on other side, then begin disconnecting.