Every fall I need to dismount my Airstreaks and put the 6:00's on, in order to utilize my wheel skis. When I put the 'streaks back on in the spring, I of course rotate them, and rotate them "properly", meaning they must be taken off the wheels and turned clear around. Just swapping left and right without dismounting isn't good enough, at least for max wear with these expensive tires.
Getting the tires (the 'streaks) free of the rims has been a struggle, sometimes just dropping it would work, other times extended periods of heavy hammer work didn't do it. Jumping on it didn't do it, I don't have enough ass on me I guess (heard that once from a guy who weighed maybe 350+ lbs, as he was getting on the back of my tractor to act as a counter weight so I could pick a propane tank I was selling him off the ground, the rear tires settled right back down

), this year I finally wised up.
What I needed was a mechanical means to push the tire down, in a controlled fashion, until it popped clear of the rim. I first cogitated over a system using a couple 2x6's hinged to the hangar wall, so I could get some major mechanical leverage. Next the machines the tire shops use came to mind, but then I really wised up and realized I already had the perfect tire changing tool, masquerading as one of the hydraulic stabilizer's on my crane

The next time I was at the crane hangar, and while it was warming up prior to heading out to a job, I grabbed one of my dunnage pads and positioned it and the tire directly under the piston and presto, that tire popped right off that rim as slick as could be. The crane has enough ass on it. It was so quick and easy I was sorry I only had 2 to do. So, no more problems dismounting the tires, plus I get to use the crane to make a living, a win/win.
