Fabric covers like the Titan are useless for my needs. It certainly provides coverage but it only takes one load item to rip it (doesn't have to be heavy, could be just from a contact point), and the loose fabric would really annoy me.
@Heater - Truck bed coatings like LineX are durable, but typically a rough surface - not pleasant to your knees and the texture hold/traps dirt.
I am 100% going with a cut to fit rubber mat, with cutouts for the airline rails. With my Gren ~9 months out I'm only collecting ideas, but I will be fitting a fridge/slide. My preliminary thoughts are to use an L-track threaded stud fitting with a spacer that meets the higher surface of the rubber mat. My L-track lashing rings will be recessed due to the thickness of the rubber, so any open sections could be filled with rubber offcuts. Nice, smooth, clean.
Regarding rubber smell, some products benefit from name brand sources with a history of rubber product production. I do find that cheap rubber quickly fills the car with an unpleasant odor. But some rubber does smell nice, like Michelin military grade tires