If you wanted those tires specifically, (Duratrac) then good for getting what you want. Otherwise a 35x12.50 (in non metric size, but physically the same) is a very popular all terrain, mud terrain and off roading tire in the states. Very easy to find, tons of manufacturers and patterns to choose from, etc.
Not sure about weight ratings, but some quick checking reveals that a 35 x 12.50 x 16 tire from Interco/Super Swamper in their SS-M16 model has a rating of 3640 pounds. I would imagine that other tires this size would have similar ratings so that should not be an issue.
Additionally, there are many choices for wheels (bolt patterns, offset, style, etc) as 16" wheels are still pretty common here, though that is changing rapidly as trucks and SUVs move towards larger wheels and tires from the factory and in the aftermarket.