Interesting post. I've long wondered about the possibility of adopting Indy car suspension technology from the straight axle era, to a street rod. Same thought about using torsion bars from sprint car suppliers, although the street rod would be heavier. Done right, it could make a great looking rod - the straight-axle Indy cars from the 50's-early 60's and the Miller cars from the 30's were quite sophisticated and beautiful!! Thanks to an earlier HAMBER post, I got a copy of "Hot Rod Chassis Construction" which discusses torsion bar set ups for street rods, although it seems to be very rare.
Dont know about a Roller Skate, but there are some Road Racing Roadsters on this Thread. http://www.jalopyjournal.com/forum/showthread.php?t=190337