Bryon:
Ditto to what's already been said. Additionally, after a few thousand miles of towing I've found the best way to find the
correct tongue weight is to load up your car, tie it down and drive your rig. Position your car a little farther forward than you think it should be to ensure things will be stable. A light tongue can be flatout scarey, particularly when encoutering cross winds and passing or being passed by big rigs.
Once you have your car tied down, mark where the front tire is positioned with a strip of tape. If things feel good, move the car back a few inches. Otherwise, move it foreward, then continue driving. It won't take long to find out where things feel comfortable. When you get your car where you think it feels right, reposition your tape for future reference. I'm sure you'll be hauling other stuff in your trailer, such as tools, tires and supplies, so consider this weight, too.
Some other tips: Air up the rear tires of your tow vehicle to max pressure as indicated on the sidewall. Do this when the tires are cold. I've found that P-rated tires won't do the job . . . they fail . . . so I pull with LT-rated tires at 50 psi pressure. Air up the trailer tires to a similar pressure. The tires will be more durable and your rig will be more stable as a result.
Happy towing.
