The tires definitely play a part, but the primary issue is that you have to compromise between handling and traction. If you want to be able to steer the vehicle without the front wheels skipping along, fighting your turn tooth and nail, you have to stick with RWD and pray there's adequate traction to keep you from coming to a standstill with your wheels spinning. And then you pop it into 4HI and the thing jumps sideways on you and damn near takes out a mailbox.
I should also make it clear I'm not blaming the car, I made the choice to buy the Trail instead of the Limited, but for the way I use the vehicle, where I drive, and the snow performance I expect, I made a mistake. I'm sure for deep snow off roading, the TEP is the superior vehicle, but I felt like it performed worse than my 2000 Nissan Xterra on snowpacked and slushy roads, and that only had the stock BFG Rugged Trails. I won't even bother comparing it to my Outback with Hakkapellittas.
I love the 4Runner, it's a great vehicle for my needs, but only with the full time 4WD drive train. As it is now I have a $40,000 truck that I don't feel safe driving 5 months a year. This will turn out to be an expensive mistake.
Anyone want to buy a Blue 2016 TEP with KDSS? It only has 74 miles on it. Haha.