Comparison of Anderson and Beech Lane Leveling systems:
The majority of our camping is in Federal and State Parks. We use the Camco leveling chock system, should not have said blocks earlier, for raising the Ollie's low side with rubber mats underneath to prevent slipping, Then chock the high side. When we purchased the leveling system, read reviews about slippage on hard surfaces like concrete and asphalt, so started using rubber mats underneath.
The Camco Leveling Chock system we use, photo taken several years ago when we still had BF Goodrich LT tires mounted on Ollie: