We bought a large Camco level from WalMart and mounted it to the front of the trailer where it can be seen in the rear view mirror. As you pull into a site a quick glance will tell you which side needs blocks and how many as each mark represents about 1".We use the Lynx plastic blocks and 1/2" plywoodwhen needed and always block both wheels. I prefer to pull forward onto the blocks, but it works either way. Also make sure to chock the opposite wheels front and back before unhitching.
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