Funny thing, my car is the only thing I tow with.
I've been to the Sam Houston National Park (west and northwest trailheads). Mud will probably never be an issue and parking is easy, ample room.
I've been to Extreme down in Crosby. It can get muddy but it ain't a problem if you have a buddy with ya. Parking is easy. It's sandy, but I've never come close to getting stuck.
Haven't been to General Sam's yet...
2014 Sportsman XP 850 HO EPS
Dark Matter Impulse Drive
Cold Fusion Heat Sink
Tri-Layer Impact Shielding
Black Lode Nuclear Dampners
Wave-Motion Ionic Inducer
And my fav: Twin Plasma Cannons in the 40W Range
Gotta love DARPA!