If you compare the tyre pressures among the various VW products, it appears they tailor the air pressure to suit the ride / handling expectations of the target market. There are some Skoda Octavias (near enough 1.5 tonne) that have recommended pressures of 29 front / 34 rear with a big diesel lump up the front.
Something as light as the Polo, you could get as low as 30psi at the rear without issues
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