Is this a horrible idea? Currently I need to get my car 250 miles from PA to NY. I have a tow vehicle (Jeep Grand Cherokee Laredo 4x4) that is rated up to 5000 pounds in stock form. This includes the stock gearing, transmission, suspension and engine setup that has 185hp and 220ft/lbs of torque. The Jeep is currently set up with a built tranny, some steep gears and a supercharger that makes around 350hp and torque in addition to some beefy offroad suspension. Will this add to the towing capacity of the vehicle or will it just make towing easier up to that specified weight? BTW, the trailer and car together weight 5400-5500lbs and the trailer is equiped with surge brakes.