"Magnum R/T, when equipped with the Trailer Tow Group, can tow trailers up to 3,800 pounds. Without the Trailer Tow Group, Magnum delivers up to 2,000 pounds of towing capacity when powered by the 3.5- or 5.7-liter engine."
"Trailer Tow Prep Group — Includes Severe Duty Engine Cooling and load-leveling rear suspension with height control "
So if your Magnum has this group, then yes it is rated for it. However, the Charger is NOT offered this option or any option similar. So the 3800lbs hitch is available, i get it, but it does not make the car more capable.