Hi Irobark,
I had never given the front wheels much thought, most of the time when I use them the front wheels are up in the air. I have a couple of Ariens here with swivel front wheels I can have a bit of a look and see what would be involved in fitting swivels. I have never had an issue with the height adjuster and I have repaired a lot of these machines, but like everything on them it can be made stronger. Are the blade carriers ok?