Self-adjusting jaws automatically wrap around the downtube for precise frame hold, and ratcheting straps secure the front and rear wheels. Adjustable mounting clamps make it easy to install and switch between multiple (compatible) vehicles.
If you are fond of kayaking, you should look into getting a kayak trailer of your own. Kayak trailers may be expensive in regular stores but you can get great deals on them from online stores which also sell bike racks.
Thule Bike Cover for 2-3 Bike Carriers | Leisure Outlet