Last month I bought a pre-owned Yanmar RS1200 rototiller to use on my B7510HST/LA302 FEL. Since I have a garage with concrete floor, I've gotten in the habit of constructing dollies for my implements (brush hog, box blade, rototiller and more to come).
Here's a photo of the gantry-type dolly I use for the rototiller. Makes it easy to move around, hookup to the 3PH and service.
Cost about $150 (mostly for the 1-1/2" pipe fittings). Cheapest gantry I could find to do the job is about $550 from Harbor Freight.