Check into Coopers, they make a lot of winter LT tires that other manufacturers do not. I'm not sure if you'll get them that large though, 285/75R16 might be the largest ~ 33" tire.
You may want to look at the Dunlop Maxx Traction, it is winter rated, and I know they make them in the larger sizes that you're after. I do not believe they are studdable though, at least not from the factory. But to be honest, any tire with enough tread depth is studdable, it just takes the tire shop longer, and it's more work which of course ends up costing more $$$$$.