ValueStar® Ease Aluminum Book ergoTrucks™ Years in development, the ValueStar® Ease Book ergoTrucks™ Series are a lightweight solution for moving heavy loads. Engineered to take library abuse, ergoTrucks™ are designed to roll over thresholds, changes in flooring, and rough surfaces without caster collapse. The reinforced shelves will not collapse under reasonable heavier-than-normal use, and ValueStar® Ease ergoTrucks™ are QUIET and maneuver easily in tight places. ValueStar® is so confident of the ergoTrucks™ series that we are offering a LIFETIME Peace of Mind Ltd Warranty! And with our no risk 90 Day Satisfaction Guarantee, you can try them for no risk!