---

Garris, thanks for looking around for me.

I think if folks look into it, you'll find that building one yourself isn't so easy - the problem is the height; once you add a caster to an existing jack, or extend the yoke to hold a larger wheel and tire, it will no longer lower enough.

I did find this one http://www.amazon.com/gp/product/B001...d_i=507846 which may be a possibility, although it's still not a pneumatic tire. You'll note that the mounting point is a lot closer to the wheel than more conventional units, to allow it to lower all the way despite the larger-diameter rolling stock.


I'm thinking about getting it to try. And then if I don't like it, I can hopefully find a pneumatic or semi-pneumatic tire and wheel to fit it.
Tim