For your 2 bikes and 2 kayaks on the back of your trailer, I recommend the 24x84 etrailer Cargo Carrier for RV Bumper - Steel - Folding - 500 lbs # e96ZR. Alternatively, you can use the Lippert Components Flip Down Slotted Bike Rack Tailgate Storage System # LC243621 more designed for the bikes but you still would need to find a connection for the kayaks. It is likely you would need to use a ratchet strap and utilize a ladder connection to keep the kayaks stable. view full answer...