Truck, tipping 2 1/2 cubic yards Aust

[Richard Coutts-Smith]

This truck is now 99.9% finished and should be at the next Corowa, however I got a confused phonecall from the owner last night. He had just finished restoring and fitting the wheel carrier that came with the genuine tipper body, but on adding one of his 10.00-20 tyre/rim, found it would not fit. I am assuming the tippers came out with 900-20 tyres, hence the use of duals??
Am I right?
Rich.