Chris is right. It's illegal to wheel in the area known as "360". I used to wheel there several years ago not knowing it was illegal, and yes, there are some really good wheeling spots in there, especially down by the river on the east side of 360, but unfortunately, it's illegal. You may get a ticket, then again, you might not. The City of Arlington at one time didn't care to enforce it, but after a bunch of drunken high schoolers were caught there, a bunch of stolen cars where chopped up there, a bunch of drug use going on in there, and a bunch of illegal dumping, the city had enough and decided to enforce trespassing laws. That was at least 2 or 3 years ago, so I don't know how much enforcement goes on now, but it definitely isn't worth the risk.
If you want to go wheeling, better to go with Chris and the Toyota Trail Riders group this weekend in Nocona, about 1.5-2 hours from Dallas. You have to pay to get in, but at least it's legal and you help keep one of the few legal wheeling spots open.
'15 Toyota Tundra SR5 TSS DC 4X4