I had a tire for my Dodge van that had gotten squashed narrow from being stacked with other tires above it, pushing down on it for a while. After trying tons of stuff like straps around it, I found that putting a loop of foam pipe insulation between the tire bead and the rim on one side let it hold enough pressure to seat the other bead. Then I took out the pipe insulation and pulled up on the tire, and the top bead seated.
This stuff:
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