Quote Originally Posted by HK1837 View Post
As above, but there was never a requirement to downgrade the GVW due to tyres. GMH responded to a market requirement and offered the new Sandman in late 1975 and used passenger tyres purposely so they could reduce the GVW on the new Sandman. You could still buy the original Sandman package if you needed the higher GVW, it was given a new option code of XU3.
good stuff HK,

I finally get to know what the whole XU3 thing is about, been wondering, to dumb to ask, cool.