I towed a 16 ft Bayliner runabout with my 2000 blazer with no problems. I now have a 2005 Colorado Z71 with a 3.5 liter 5 cylinder with 220 hp, thats what the mfg says. Anyway it pulls the same boat like you don't even know it's there.
No that's not a mistake it really does have a 5 cylinder.