It is not extended. I guess I could have gone with a smaller model but they come with smaller tires too.
Something to keep in mind is that when you pack the keyboards vertically the center of gravity goes up. In my case it's not a problem but my 88-keyboard is just 55lb/25kg, including the case. Supposing that it was, say, 100lb package the cart might become wobbly.
On the other hand, I've been in situations where there were so tight corners that if the truck had been extended I would have had trouble getting through the corners.