The sidecar setup to hold gear is brilliant. If the two designs in these videos were merged into one I think it would be pretty dialed in. I imagine there's gotta be some weird twisting physics at play since the weight is offset by a few feet off on the other rail and you're pulling that weight from the bike side. Surely there's some twisting/bending forces on that telescoping rod. Seems like a hinged square telescoping tube with a shock would help with that.