What makes the Echo different from the Apollo?

Theere are a number of key differences. The Echo uses our hard-mounted 10 In. EVO wheel system, is compatible with our hydraulic brake system, uses an external main frame system for increased rigidity and strength, has height adjustability, includes a combo locking top and bottom drawer, has a 3-sided top shelf, and is intended for studio use. The Apollo uses our removable 10 In. EVO wheel system, uses an internal main frame system, is not height adjustable, includes our Hinged X-Top Shelf with Integrated Threaded Rail Plates, can be easily reduced into a compact case (7.5 In. thick) and is stronger than the Echo despite it being able to fully collapse.