Yakima TRACK HARD TOP KIT
Originally designed for use on Jeeps with hard top covers, now sold for any fiberglass custom application such as campers and truck toppers - about any surface with underside access.
Yakima Bigstack Kayak Rooftop Carrier
The BigStack's narrow profile takes up the least amount of rooftop space and carries up to four boats on their sides. It's padded to protect your boat and vehicle, and the steel-reinforced arms fold down when not in use.