That is a question I have as well. I occasionally transport my sport touring motorcycle (600+ lbs) in the bed of my Canyon with the rear tire sitting on the leading edge of the open tailgate. As the R1T bed is shorter (according to all specs currently available) the rear tire is going to be about in the center of the tailgate. Strength is definitely a concern.Those silver anchors in the bed are for the roof rack bars, if you needed to elevate a load over the wheelwell bumps.
I'm curious how much weight the tailgate could support. Due to the 180 degree capability, it lacks the support cables that traditional tailgates have.