P.S. you may not win any races towing but it will accelerate fast enough to not be a problem with merging into traffic.Definitely ! We just upgraded to a 2019 Sierra Denali 1500 with the 6.2 to tow a 28' camper weighing in at 6500 lbs.
But we towed that camper with our 2017 Colorado Duramax 2.8 crew cab short bed using weight distributing hitch and it towed unbelievably well.
We averaged 13.2 mpg towing that at 60 and 65 mph. But I just wanted more umph for the 6% grades when we go in the mountains later this year because the new camper is almost 1,300 lbs heavier and quite a bit longer..
We previously towed a 22' Coleman 1705 RB camper that weighed in at 4123 lbs loaded and it walked up those mountains at 60 and 65 mph and it averaged 14 mpg when we weren't in the mountains.
You shouldn't have any problems pulling the boat due to the fact that you won't have that much drag to deal with like our 8' wide 15.5'tall campers did.
Pulling a camper is like dragging a parachute behind the tow vehicle.
Good luck and let us know how you make out with it.