oric_dan:
This is more what I had in mind for idler wheels, although smaller than 10" :-),
http://www.harborfreight.com/10-inch-pneumatic-swivel-caster-38944.html
Doh! Just saw this comment - you already know about 'em! Heh! 
oric_dan:
This is more what I had in mind for idler wheels, although smaller than 10" :-),
http://www.harborfreight.com/10-inch-pneumatic-swivel-caster-38944.html
Doh! Just saw this comment - you already know about 'em! Heh!