Just thinking about it, it might be a bit of a gnarly problem!! :sour:
Regardless of the why, if you tried to set a chair up as an outrigger to a Spyder, you'd hafta be bloody careful where you tried to mount it & hafta think a bit about where the wheel on the chair was with respect to the front steer wheels & rear drive wheel on the Spyder, as well as where to aim it or it'd scrub to buggry whenever you tried to turn towards it.....that is IF turning the Spyder steer wheels but still having another 'load carrying' wheel trying to run straight ahead on the inside of the turn would even let you turn!! Turning the other way, ie, with the chair wheel on the outside of the turn, the chair wheel would only need to turn faster than the driven & steer wheels on the Spyder, & a normal 'ground driven' wheel aimed straight ahead should manage that OK, albeit with some (orright, probably a lot!!) scrubbing as it got dragged around the curve.
Normal suspension should be able to handle any up/down loads during cornering, but that 'inside of the turn' thing would be an interesting problem from a positioning, aiming, and an alignment point of view too!! Going slow enough &/or turning tight enough towards it, you might even force the chair wheel to turn backwards, but if the chair wheel was in the wrong spot &/or it's aiming angles with the steer & drive wheel weren't exactly right, it could inhibit the inside turn a lot, while dragging & slowing an outside turn!! :shocked:
Add to that the issues that having an outrigger wheel might cause re 'drag' while trying to ride straight &/or braking, plus the difficulties of setting up/aligning the Spyder 2-wheel steering & suspension geometry to run straight with the addition of an outrigger wheel, let alone doing any of that stuff while turning.... It'd be a bit of a nightmare problem. I certainly doubt it'd be anywhere near as easy as it is to hook up a chair on the side of a 2-wheel motorbike - in fact, that's probably why BRP went down the trailer route in the beginning!
Still, it's food for thought! :thumbup: