Back on the topic of breaking your back bending over splitting wood in the summer I was helping a family friend split 20 cords of oak and beech well anyways my back started to get sore so I put the splitter up on 6x6 blocks and it was quite nice but that want enough so I added some more and I stuck a piece of wood on the splitter started splitting it and the splitter rolled on me and broke my ankle
Here's a pic of my apparatus before I added blocks
I hate those tiny tires. Just upgrading those to a decent highway rated tire would raise it up plenty. Another idea but might not get you high enough would be a set of automotive ramps.