I don't care one way or another about anyone wanting the wedge stationary or on the ram, however looking at the picture reminds me of why I wouldn't want the wedge on the ram. That being the "log dislodger" in the picture that apparently is there to scrape a stuck (lodged) log off the wedge when the ram returns. Sticking a log happens fairly often, and I would rather have it stuck on the stationary wedge, and not returning with the ram.
If I have a log stuck on the wedge, I often will return the ram, and drop another unsplit piece onto the splitter, and then use it to push the stuck piece off the wedge. Also, if that doesn't work it is easier to use the maul to pound the stuck log off the wedge. Just my 2 cents (or less).
My splitter has a box beam that the pusher rides on with a surround box that keeps it straight (no I- or H-beam). On splitters that are used a lot, the slide on the I- or H-beam tend to wear a lot and need a lot of attention to the wrap-around guide holding the pusher to the flange. There is no binding on the set-up that I have, and since 1989, there are probably about 800 hours on that splitter (co-owned by 5 different people to start with, now down to 3). The total cost for each of the original owners has been less that $250 each, and the machine still runs good. It has a box beam for an axle (and oil) with the 8HP Briggs and pump bolted on the axle beam, and a ram on top of the splitting box beam (I will take some pics and measurements if any interest). Some modifications by adding a third wheel to allow easy manual movement around the woodpile, and to tow with small tractor or ATV. Also, a trailer hitch for towing on the road.