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I have a full length Alloy rack and its the right size for me. I have a 2.5m awning bolted to the side and carry an Oz Tent RV4 and the full length is Just long enough to accommodate the OZTent...

I have an ARB full length. Which is not noisy at all. But my inlaws have a full length rack with a cage mesh floor that rattles noticeably. It's handy to have the full length, but not necessary. Need...

Personally I'd put a half rack up there for 2 reason.
A full length one will allow more on top, meaning more weight
plus a full length one already weighs enough
Half rack for a tyre/wheel combo...