If the steering is turned while the front part is vertical the contact patch will move off the vehicle centreline due to the castor angle of the front wheel (or maybe that should be called 'trail' on a bike?). So there would be some steering effect on the rear at low speed when the front is vertical but maybe it will even out once the vehicle is moving and the front leans? I cant quite figure it out but either way I feel this would be insignificant or at least within the rider/driver's scope to allow for.
This is a very interesting subject and it may be necessary to braze up a simple test vehicle!

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