Great report. I have the GM 3.6 liter DOHC V6 in one of our vehicles and I've always been pleased with the power this thing churns out and the MPG on the highway. A very good, high winding engine with decent torque in the low and mid range power band.
Looks like you have an excellent towing combination. I know the GMC Canyon/Chevy Colorado is supposed to be a mid sized truck, but to be honest, sometimes I've had to look twice to tell the size differential between these two and the GM full size, half tons.