Hey mate, got it on the Coromal camper trailer that we bought in 2009, for $1000 it is NOT worth it.
For the 2011 swan outback we bought, I bought 4 cans of scotchguard and did the cushions and curtains near the stove.... made sure I gave them a good covering as per instructions... I have no kids but 3 border collies that would rather sleep on the cushions than their beds..... I also bought some Migures carnauba wax for the outside...
By the way, did the same on my new Pajero....
Regards
Scott