BASSBOSS VS21-H-WC Vertical Wheel Cart for VS21 SubwooferBASSBOSS wheel carts feature the same exceptionally durable, heavy duty build as our subs. Carts are custom designed for balance and placement to make the process of getting from vehicle to venue much easier. Subwoofer feet fit securely into the custom fitted foot pockets for stability and ease of movement. Subs can be left on carts for the gig by locking the casters into place. Flip the lock at the end of the night and roll right out the door.