I have it in mind, and I know not from where so I may be completely wrong, that there is a legal obligation on Australian companies to supply spare parts for their products for 10 years - you may wish to check that out and if correct get back to Dometic?
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I have no idea what the roller looks like, but assuming it is a hollow aluminium extrusion it will be 6060 alloy T5 temper.
If you make up a block to the diameter of the tube for the pivot point, & just a simple block at one end. You should be able to pull the other end if you can lever it far enough.
Or take the tube to a metal engineering/welding/fabricator shop (steel or aluminium) & get them to put it through some rollers. The have plenty of different diameter dies for rolling tube to any radius, within reason.
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