Your SRT6 does NOT have reverse polarity.
It is a negative ground system, like all modern cars.
All you have to do is be careful when connecting any battery charger to first connect the positive ( red ) lead to the positive battery terminal, then connect the negative ( black ) lead to any convenient body ground point.
( or, if you are like me, connect the negative to the negative battery terminal, however I absolve myself of all blame should something bad happen )