Towing a Car Trailer

I should have stated that the trailer is equipt with brakes on all 4 wheels. As for what I will be hauling it will be ac66 Dart. It should end up aroung 3000 lbs. Trailer is 1600 lbs. The Lexus has a cooler and I already use it with a utility trailer and tractor. This will be a little more then double that total weight. It handles the trailer with tractor very well but there are no brakes on that trailer.
Thanks
Rodney