I had made a PVC bike rack that stood 5 bikes up in the back of the pick-up. I bought a topper when I bought the new Eagle last year. I broke the PVC bike rack apart into individual tire holders and they keep my bike tires in the groves on the slide out tray. I put four bikes on my tray and secure them with ratchet straps. I use a couple pieces is swim noodle between them before I tighten the straps.
2015 Jayco Eagle 314 BHDS
2016 Ford F-350 Super Duty CC PSD SRW 4x4