235/75R15 should fit no issue. As to what you need, well not sure how you operate daily.
My daily tires are Goodyear Wrangler Trailrunner A/Ts. These are kind of the modern answer to the old school Goodyear Wranglers, which you can still find around. I have no issue running these on trails. But my "pure" off-road tires that I run on trips I know I'm going to be seeing mostly off-road use are Achilles Desert Hawk M/Ts. Same size as above but also rate for a heavier load. I swap these on as needed and put them to the side when I'm mostly daily driving.