[taberski]

We actually considered a very similar design last night, but the team ultimately voted against this configuration.

Our thought was to think of it more as a 2 wheeled robot, with the center-line of the wheels just forward of the center-of-mass. Then, the caster would be very lightly loaded - the thought was that the tongue weight of the trailer, plus the moment provided by the hitch, would provided the required stability.

What we envisioned was basically an articulated design - similar to a scraper (earth mover), but with a supporting caster.

In the end, we too felt that with such limited traction, all wheels should be powered and felt that implementing a powered caster was more than we wanted to take on.

I'd like to see it done!

Kevin