I made a backhoe dolly for my bx24 out of a left-over length of lam-beam & 3 tool chest casters. Cut the beam & bolted it together in a T shape, & put the 3 wheels on the bottom. Was one of those rare projects where everything worked out just right the 1st time, took all of about 30 min & works perfect. Fast on & off, small footprint, & sturdy too.
All wheels need to swivel to make it easy to reinstall, or else you'll need a lot of swing room to line it up.
Why? Serious here, the BH dolly has been around for years. Why would I do all this work when Harbor Freight has 2 for $18....