If the tires are inflated to a high pressure, they won't have a lot of traction offroad whether they're skinny or wide. Once they're aired-down, they will either have a long contact patch or a short one. A long contact patch works like a tank track. It will provide maximum longitudinal traction for moving forward, and it will provide good flotation on sand, mud, or snow.
It's only when you air down that the tall, skinny tire as an advantage. On the street, you might as well get the 22 inch wheels so you can fit the bike brakes, and 40 profile tires. That way the vehicle has enough traction to stop on a dime, and won't wallow in the corners. But it doesn't matter if those are 275, 315, or 335, they won't have much traction offroad even if you air them down. Air down an 85 profile tire, even if it's only 235, and it will provide traction offroad like a rubber track.