4 months since posted but maybe I can add something after the fact for the next bits n bobs to think about
I used to run a watsonian double adult sidecar outfit (its in my field at the moment, but on the wrong side for my current location) and dabbled in that side of things a bit, two things, first if you swap out your forks for leading link forks instead, you will be amazed at the difference in handling and steering and general manageability. The tele forks tend to lock up under the different demands and forces the chair places on them. Its well worth considering and you should snag a ride on a outfit thus equipped to see what I mean. If you must keep the tele's for solo use, there are dedicated chair dampers which can tame the tankslapper that sooner or later may happen. I removed mine for testing one day and got into a uncontrollable slapper at 20mph and had a moment trying to kill the engine while it was thrashing about wildly...
Also if you fit a brake to the chair make it independent from the bike's brakes. I don't know how much road time you've had on it it, but you must have had the problem on long sweeping slow bends curved in the direction of the sidecar, where while you'd normally accelerate gently round shorter ones, you run out of acceleration near the apex on a long curve to do this and end up fighting the bars wrenching your back maybe (or maybe I just rode too hard on the thing!). If you have a independent chair setup you can touch the chair brake and drag the chair slower gently instead and that will pull the bike round the curve a lot easier and more in control, no fighting bars at all, and you can still do the same for bends the other way with the bike only rear brake. Just another string to the bow of how to control. If you ride the bike solo, you can mount the pedal etc on the chair so it stays with the chair.
Last one, if you loose your mind and take it up the drag strip (which we did for a laugh), pull up to the line skewed so the chair is ahead slightly of the straight position, then when you get the go light you can dump the clutch and get on the throttle and itll naturally pull straight. By which time your launched and charging down the track while your compettition gets their wits together still
My watsonian was on a 750gt kawasaki, and we took it run-what-ya-brung at the bulldog bash one year for a laugh and came within a hairs bredth of taking the sidecar class (and would have if a 9 second 7L blown dedicated 3 wheel drag car with no electrics/bodywork/lights running on methanol hadn't been allowed to race in our street legal class, but hey he was a guest of the organizers and we were nobodys so what to do...)
My chair was good fun, sometimes I consider dragging it out and bolting it the 750 turbo which has the same fitments and chassis as the gt and maybe Ill do that when my family gets a bit older to take them out in it... But you might sometimes think the same things why not to, that is you get wet when it rains still, and still get stuck in traffic. Worst of both worlds of car and bike in one for day to day use.
