Manual tire machine for large diameter wheels

[volleyball]

Lots of manual machines out there but I haven't found one that does larger rims such as 20".
Has anyone found one?
My ancient air brake cannot handle them

 

[volleyball]

Cannot believe no one has come through.

 

[djbmw]

If you're pulling rubber off a 20" rim then that rim/tire combo likely costs over a grand for all 4 wheels. Manual tire changers and expensive rims/tires dont compute. I mean... if these are **** rims and junk tires that are not low profile or run flats then just do it on the ground with several tire irons. Otherwise.... buy a used tire machine with a helper arm/bead assist for a grand if you want to DIY it at home.