Amazon.com: Kayak Roof Rack - J-Bar Hooks Canoe, Surf-Board & Kayaks Carrier - Universal Fit for SUP Roof-top Rack Mount on SUV, Cars, Truck, Car Cross-bar with Tie Down Straps & Accessories :
Finally mastered the j hooks and securing the kayaks in around 20 minutes after struggling with them last year : r/Kayaking