Robert........The front of the Spyder is supported by a concave roller in the center on top of the top tube. There would be a pin to secure the roller to that tube.
Carlos.......I was thinking about mounting a ball bearing roller that retracts up into the car just in front of the torsion tubes of the front axle. This way it's out of the way when not in use. Perhaps use a screw type electric linear actuator to retract it up out of the way.
The mystery for me is how to make the trailer "kneel". Airbags with a cantilever suspension perhaps ? Or maybe just a simple bell crank ? Maybe it's possible to just use airbags hooked up directly. They seem to collapse in and onto themselves.