differences between US and EU trailer

i think it was 1300mm here and many of old warehouses are still 1300mm

so mega trailers here mainly have dual height ride to adjust height

19.5 is good

problem is 17.5

or 22.5 with very low tires ( 455/40r22.5)

problem will be with 315/45r22.5 which could become standard for low liner tractors