I have a friend with a extra cab Colorodo with the inline 5. He did the same thing downsized but from a crew cab silverado. He tows a stratos old model. He says the truck seems peppy until you hook up the boat then it works really hard and shifts alot. Gas mileage is worse than the fullsize while towing only. He says as long as you can plan ahead for stopping its ok but if someone stops suddenly it doesn't do so well. Just what I gather from the rants at lunch everyday. I suggest you take one for a overnight test drive and hook it up and drive. Good Luck