Are you asking about the tongue jack? I've never seen anything larger than a six inch wheel but have seen some two wheeled tongue jacks.
Harbor Freight has a true trailer dolly with 10 inch tires for $60. Many people have found them to be helpful getting around tight spaces. For the price it is hard to justify "jacking" around with other might or might not help options.
600 lb. Heavy Duty Trailer Dolly
This falls into the class of merchandise I will buy from Harbor Freight because it doesn't have a motor or a power cord.