I carry a Revo 11 and 13 on my trac-racs, upside down, side by side. I tried the saddles but carrying the hulls upside down was simpler. I may still have the saddles around here if you are interested and decide to go that route.
This is a photo of my Revo 13 and my old Scout. They happen to be sitting upright at the campsite for convenience but for long distance, I carried them upside down.
