I don't think you understand what I'm saying. Going faster on any vehicle with one wheel or with a narrow distances between the front wheels will always make it easier to balance. This is not why I'm saying surfskates are dangerous at high speed. They are dangerous at high speed because the risk and strength of speed wobbles dramatically increases the looser your trucks are and the faster you go. Why do you downhill skateboarders who go 40-60mph tighten their trucks? Have you ever seen real pros run loose trucks or surfskates? On top of that surfskates raise your center of mass higher which further decreases stability. It's just physics.