3000? You'll be fine. Towing a boat is not like towing a travel trailer. Far less wind resistance. And your weight is less than my old hybrid travel trailer was at 2500#. My old '03 Trailblazer EXT with 4.2 I6 towed it beautifully. Your TB is much more capable than what I had. You may need to turn on 4HI when on the ramp. The only issue I can see is if your trailer does not have brakes but I'd be surprised if it didn't.
Everything you need to know about your towing capacity is listed in your owners manual. Stop reading what you find randomly on the Internet. More often than not it doesn't tell the whole story. If you don't have the manual, download one. Also join
GMT Nation. Lots of very knowledgeable folks on there that know the GMT 360/370 platform inside and out.
