I think to answer your question Cliff, I would have to ask, what do you call suitable for racing? Also, what do you call reasonable shipping time?
I would suggest you check out Cannonball Rigs out of Wisconsin, or Outlaw out of New York. Depending on exactly your preference, Risdon Rigs in Michigan make a very nice rig, not what you may consider as " racing " rig. But I know many people use them for dryland racing.
Thanks Mark - I found a really lightweight second hand Chambers cart that will suffice nicely. Your right- nothing wrong with a Risdon - had one in Two Rivers last year and it was SO fun.