Motivated by videos such as 1, 2, 3, my grandparents desire to rent a SUV with all-wheel-drive (ATVs appear too risky to them) to explore such trails situated in the wilderness. Ontario Trails differentiates ATV Trails (which greatly outnumber) from the 5 SUV trails.
Ontario Trails lists all such trails, but fails to distinguish and confirm each trail's level of difficulty, extent of the roughness or possibility of impassable hazards. The videos above depict, on these trails, large rocks/boulders, water currents and water bodies of unknown depth, about which any trailblazer must be premonished (as far as possible) because they can easily obstruct a SUV.