Just took delivery of that 26" x 2.0" Schwalbe Marathon Plus Tour....
My gosh, thickest tire through the treads than any tire I've seen, look like it would work on a motorcycle. It weighs a hefty 1,100grams, about half again as heavy as Schwalbe's own Big Apple in that size (710 grams). Aggressive tread blocks, but in a quick trial it rolled smooth and at least as quiet as the Serfa Drifter on the front.
This might just be the ultimate urban warrior tire, and if I were going to tour off of the grid around the world, this would be the tire I'd choose.
Mike