RWA = Rear Wheel Assist (like FWA, Front Wheel Assist on tractors).
Yes rice is grown in areas of New South Wales mostly. As for the combines, there probably are some with tracks but also ones like this (with the RWA), as I guess these machines can be used in a wide range of crops too.
Quote:in think there was a reason for that
but cant remember what it was
as far as i know
its just usually done on non driven wheels
The tires are supposed to last longer if the machine does a lot of time on the black top. Thats what I was always told anyway. Can't say i'm convinced but a lot of people do it over here in the UK and Ireland.