A Trail Blazer SS has a 6,600-6,800 pound tow rating, and you're pulling 6 tons? As in: 12,000 pounds?? 6 tons in 16 feet... are you hauling lead weights? 😱 Sorry if those questions sound critical, but since you said you are new to boating, too little tow vehicle can make for a very dangerous situation when towing a big boat. Also, a weight-compensating hitch will help with heavy tongue weights. Most truck maximum tow ratings are with a 5th wheel hitch, and have lower tow ratings for a bumper-tow trailer.
A typical Class 3 hitch has a tongue weight limit of 500 pounds. To safely tow up to 12,000 pounds with 1,200 pounds of tongue weight, you'll need to have a Class 5 hitch, properly installed to the vehicle frame.
Just passing on some friendly, hopefully helpful info (to keep all of us on the road safer).
Jim B.