Dallas is actually very strict about towing and booting. It's well-known among veteran con-goers that chances are near 100% if you're parking in the wrong place, you WILL be booted and/or towed. The hotels will, depending on the chain, take down license plate numbers or ask about the car you're driving to verify against when the tow truck comes around.
To be honest, if you need a parking space and you're NOT staying at one of the area hotels (or don't feel like paying the Anatole rates), just go park at the Dallas Market Center. It's entirely free parking, and you don't have to be a vendor to use it. Yes, you'll have to walk a little, but that's the case with any of the other hotel lots, to be honest. You won't have the higher risk of towing at the Market Center.