I know this is a very old post but...
I'm planning on building a storage cart for my 46 and am assuming 80+% of the weight (approx. 700 lbs) is contained in the back half of the implement (bucket thru seat) and the front portion of the frame is the remaining 20% (approx. 200 lbs).
My plan was to use a 2x6 frame with doubled 3/4" plywood base glued into dadoes in the frame using 6 heavy duty 5" swivel casters (600 lbs capacity each) for mobility. I assume that would be more than strong enough to support the 900 lbs weight of the 46.
I was planning on using a floor jack under the cart (positioned under the shaft hooks) to lift the frame (with cart) off the shafts so I didn't have to fret over the final height of the cart so long as it was close. I would just roll the cart under the 46, remove the drift pins at the front of the frame, jack the cart to lift the 46 off the shafts then roll the tractor forward and lower the jack. Sounds straight forward but I'm likely being extremely optimistic...
Am I in the right ballpark with my assumptions on weight distribution? Does my floor jack idea sound like it would work?