Ideal for Smooth or gradually sloping bottoms. 
The Premium Roll In Dock is Easy to install and remove.  Includes Everything Needed to Assemble One   4' x 10' Section.  (1) Premium Aluminum Frame with Protective Resin Sidewalls, (1) Resin Dock Top, (2) Adjustable Dock Legs, (2) Dock Wheels, (2) Premium Wheel Attachment & (4) Premium Accessory Brackets.  

Combine Multiple Sections for Unlimited Configurations.  Each Section Weighs Less than 200 Lbs.  No Need to Get Wet with 39" Adjustable Leg.  Don't Forget Additional Dock Accessories - Ladder, Bumpers, Cleats