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@provenrad
Tommy - I think it is more complex:
1) Shorter wheelbase would make it easier to unweight the rear wheel, as you do not need to move your weight as far for an equal reduction in normal (perpendicular) force.
2) if you use a front brake to initiate a skid, then the moment (around the front wheel contact patch) will lift the rear wheel more easily with a shorter wheelbase - because the centre of mass is closer (further forward) than for a longer wheelbase... roight?
The tandem thing occurs because the lack of stoker means the centre of mass is much further forward than otherwise..
Please excuse my a-level physics thought-experiment jibberish.