I can see on some of the pics that the trails are nice and smooth in places... But I also see a lot of tough obstacles, down the hill, and the fallen trees. In our woods, the prison crews would have smoothed out and graveled those, and they go through the mud holes and add drainage underneath, bridges and culverts, and lots of rock and gravel :~D It's nice, when there's a correctional facility in the forest and a lot of cheap labor! That's why we have all the nicely over-maintained trails, it wouldn't be that way naturally.
The Backcountry Horsemen chapters also each adopt trails and go through in the spring cutting back brush and doing lighter maintenance. ecurbh and I will get around to joining one of those eventually.
Our prisoners work the roads on the chain gangs still here! LOL. I wish they would clean up some of the trails or make new ones. The obstacles are rather challenging at times but makes for a good ride. Never a dull moment that is for sure!