Since someone else brought this back from the dead...
There are numerous unpaved roads throughout York and Lancaster, you just have to find them, including sections of Gut Rd, which last I heard still has some spots to get stuck on and is not well maintained. Further Southeast along the river is River Rd and River Farms Rd down below the York Furnace. Far to the south is Trails Rd, which I understand is not an easy wheel and you shouldn't venture alone. I've also been warned that if a rig breaks down on Trails not to leave it unattended or it WILL disappear. Maybe local legend, maybe true, I wouldn't want to find out.
From what I understand Trails Rd is also an access road for some cabins and such that are situated back along the creek. I would avoid altercations with these landowners at all costs. Trails is a public access but only barely according to Penndot and patrolled by State Police so if/when you have a problem help may be a long time coming.
I think the point is if your looking for a spot to put it in 4wd and take a cruise through, some of these unmaintained areas would be great for you, but if your looking for more than a little mud on the fenders you'll need to try RC or take your chances with the local PD.
There just ain't much legal wheeling around here. Get to know your local landowners, maybe they'd let you play.
Personally it's worth it to me to take it up to RC a few times a year and challenge my rig. Well worth the drive and the money and I don't have to worry about tickets and trouble with the law. Plus it's beautiful up there and RC is deffinately a worthy cause.
Ultimately just respect where your wheeling. Tread Lightly. We lose more and more land annually to closings and privatization and such that we'll simply never get back and taking your rigs places they shouldn't be to do things you probably shouldn't be doing gives our entire community a bad name.
PS I would expect any property around Harley to be posted and or private even if it is not posted. If you happen to find your way down along the Codorus Creek in that area it is patrolled by Springettsbury PD as well. And Gut has been notorious lately for the fatal accidents and such. I would suggest to use caution up on Gut and especially down along the River past the train bridge as the River likes to swallow vehicles.