I'm going to stick with the ' pitch-allowing', motorcycle front fork-to-trailer hitch-type connection to the car.
This will allow pitching freedom at both the hitch, plus at the trailer's swing-arm.
The 'fork' will have a minimum of 'rake', to allow for automatic 'centering' of the trailer, trailing behind, plus 'yawing' in turns.
There won't be any 'roll' allowed in the connection, which extremely simplifies the gap-closure, which will be an inflated bladder, energized at 45-mph, once away from 'urban' driving scenarios.
Since it's a 1-wheeler, there won't be any rotational torque ( roll moment ) induced, as in a two-wheeler, where one tire might experience a different elevation from the other ( pot holes, or oblique driveway ramp attack ). K.I.S.S. methodology.
The trip to North Carolina will allow me to simulate the aerodynamics of the 'singularity' in the wind tunnel. And if I like the 'numbers', the mockup can become a 'plug' to create tooling for laying up a thin-shell composite trailer body to pull behind SPIRIT. The 'numbers' will also inform me about any expectations about the BOLT trailer performance.
I was close to having everything ready for the 2017 testing, but just couldn't pull it off in time. No cigar!