The tires in the photoshoot are 255/30/20 and 295/30/20. These were picked by the owner based on the suspension setup.
You can go up to 275/35/20 and 305/35/20 on these wheels without issues. Michelin, Nitto, and Pirelli all make 305/35/20's.
Do the rear tires at 295 with 45mm offset exceed the fender? If so, by how much?