The J model has two 75 lb flywheels. The HD model, which is the middle one of three available, has two flywheels at 90 lbs each. Plus the engine, rack, and framework. If you bring the wheels back much the could be in the way of feet. I definitely get what your saying about mobility and the hitch being on the "proper end", which is opposite the split wood pile.
A week after ordering the SuperSplit HD I got a hernia. I got it taken care of with the mesh. When healing I could lift things, but not lift and push anything. So I couldn't use the splitter for some time. I soon made forklift tubes for it, so I could pick it up and place it in front of the conveyor, and move it inside at night without lifting and pushing. Later, when I worked further from the house, I added four wheels to tow it with the quad. There are only eight bolts, four on each end, to change the legs out.
Another good SuperSplit mod is a phenolic table covering. Did that Sept. '17
I left the fork tubes on when I did the four wheel conversion. They are separate mods, and the tubes unbolt with two bolts, one in each leg.
(I know you guys like pics, even if posted before.)