Notice the side panels have wheels at the bottom, so when you're using the cover, it's rolling. Not sliding.
The Boat Guard is a MANUAL cover system. NO MOTORS to BREAK DOWN!!! Motorized covers are not reliable and, in most cases, have problems that need repairs in the first or second year. If a motorized cover breaks down when it's covered, you're not opening it. If it breaks down when it's uncovered, you're not closing it. With The Boat Guard, you don't have to worry about that, and you can use your cover year after year with CONFIDENCE; and The Boat Guard is HALF the PRICE.