Kozak,
I own a 2000 GMC Sonoma 4x4 4.3 v-6. I tow a 18 foot fiberglass fish and ski boat and have never had any problems over the four or so years I have been towing this boat. I am from Indiana and have towed the boat to Florida, Kentucky, Tenn, etc. I always tow the boat with the trans in drive not overdrive. The mileage suffers but the transmission is happier that way. From my experience you should get along fine with your current tow vehicle.
Ron