Need something that will stand up to dogs, muddy hiking gear, sandy wet scuba gear, etc.

... we have a synthetic liner from Audi that is quite rugged in the back of our '99 A6 Avant - is the luggage area in the Allroad of the same dimensions?

I'm using the cargo liner from a Subaru and floor mats from a Volvo until the utility packages come in. I went skiing and needed something for protection from the snow.