I still think we are talking apples and oranges, meaning there is a huge disparity between what some of us mean by "more difficult" trails and what others do. Not trying to bash anyone, but just because it was hard for you does not mean that its a hard trail.
In Arkansas, trails are usually a little wet in places. When I say more difficult trails, I'm talking about trails 3+. If its dry, everything will be a little easier.
Trail Rating
Now, I will follow up my statement by saying that most of the surfaces I take groups down are improved. These bladed or gravel roads also tend to be the most scenic. I would not call these trails, rather dirt roads. Off road means trails, with little to no maintainance. These can get rough. At least from an overlanding perspective, I desire scenery, history, and solitude. Sometimes that means you have to have a built 4wd to get there.
2wd doesn't mean no fun, rather take it easy fun. As always, judgement is of critical importance. You are after a good time, not a broken truck or a thrashed trail.