Can anyone recommend a decent platform with castors for my ballast box? Mine is around 670 lbs. I bought one of those cheapie dollies from Harbor Freight and while it seems to support the weight the casters don't want to swivel or turn under the weight of the ballast box.
I'm not opposed to building my own platform but I'm not sure what type of castors to use. I checked a few places on line and the choice of styles and tire designs is somewhat overwhelming.
I appreciate any suggestions that might save me from reinventing the wheel.