Subaru’s own specifications for this car quote a 750kg unbraked towing limit and a 2000kg braked limit. That in itself suggests that a 750kg trailer or camper should not tax the driveline in any significant way.

That said, logic suggests that towing any sort of decent load – especially at high speeds or in hot weather – must have some impact on wear and tear, including that of a CVT transmission. However, the Subaru CVT seems a bit tougher than some similar units out there, and if not abused, there should be no problem with what you have planned.

Regular maintenance and sensible driving will be the key to the CVT’s survival, as it is with any aspect of a modern car.

It certainly sounds that way. The clutch’s job is to join the engine to the gearbox while still being able to disconnect them when you need to idle the car or change gears. If the clutch is worn out, you’ll find it slipping under load, allowing the revs to flare up and the vehicle not moving much. This sounds exactly like what you’re describing.

At the least, you’ll need a new clutch unit, but if it’s been slipping for some time, there’s a chance the flywheel has been damaged and will also need to be replaced or machined. I’m tipping that when you tried to reverse out of your parking spot most recently and revved the engine out with no motion from the rest of the car, there was a terrible smell a bit like the smell of brakes in a railway station when a rain pulls in. If so, that’s a clutch failure for sure.

You've tackled this in the appropriate manner, giving the dealership from which you bought the car every chance to make it right. But that hasn't happened, so now is the time to talk to Subaru's customer service division at head office. 

The good news is that the problem has been logged as a pre-existing condition, so it will be covered by your new-car warranty even if the car is technically out of the warranty period. Also, Subaru has not ignored the problem nor refused to accept it exists, so that's a positive, too.

If for some reason, Subaru wants to abandon you and your problem (which won't happen given its approach thus far) then you could talk to the ACCC. Australian Consumer Law has some fairly rigid rules regarding products that aren't fit for purpose. This, however, would be your last resort.

It would bother me a little that the car was making a weird noise from the front suspension, and I think you've probably got a case for not wanting to drive the car until it's fixed. This could be where you tackle the customer service division for the loan of a different car until yours is fixed. I don't think that would be an unreasonable request and may hasten the problem's resolution.