Had the old trol given its first wheel alignment since I've had it. the mechanic gave me the readout sheet and pointed out the castor angles. He reckoned that the Nissan, being a Japanese vehicle, had the incorrect castor for Australian roads. He suggested, strongly, I should have offset bearings fitted to the left hand swivel. He reckoned that the outer edge of the left and inner edge of the right tyres would scrub out. is this a fact, luxury or what?