For smaller boxes I like these:bgavin wrote:I have a number of Penn and Harbor Freight fixed casters. For my needs, they require mounting to the lower reflector plate. I don't like casters hanging off the ass end of the cab. They have a tendency to buzz, and to snag the shins of the unwary.
http://www.partsexpress.com/pe/showdetl ... er=262-282 They hang about 5/8 inch, so a with pair of these on the opposite side
http://www.partsexpress.com/pe/showdetl ... er=260-770 you let the box rest on two wheels and two feet. The box won't roll and the wheels won't rattle.
Then put one of these on the cab and you're good to go. http://www.sciplus.com/category.cfm?subsection=20
The picture shows these with a plate for internal mounting, but it can be removed to mount the rig on the outside of a sealed cab.