I've spent a good part of my life four wheeling, and back country exploring, and have done most of the well known trails out west. Between Jeeps, trucks, ATVs, and UTVs I've owned more winches than I care to add up. Right now I have three vehicles in the garage with a winch on them, a Can Am ATV with a 2500 lb winch, a Polaris UTV with a 4500 lb winch, and my Ram 3500 with a 16,500 lb winch on it. If you go exploring alone a winch is one of the most important items you can have on your vehicle. I don't have a winch on my Colorado because Chevy went and released the ZR2, so I don't plan on keeping this truck for more than a year, and I have other vehicles I use for back country exploring. When I get the ZR2 it will get a winch.
You learn to drive with the winch in the back of your mind all of the time. When you come up on a difficult section of trail you instinctly look for winch anchor points. If there is no anchor point, and you don't think you can make it, either go around, or turn around and go back. I've learned to drive with a front mounted winch always in my thoughts, and maybe because of that, I can't really think of a time when I would have used a rear mounted winch. I would have to completely change my thought processes while driving, I would have to drive with the thought of "what is going to be behind me for an anchor point".
I've attended numerous four wheeling events over the years, and have seen a lot of built up trail rigs. I've seen many of them with both front and rear mounted winches, but I've never seen a vehicle with a rear mounted winch that didn't also have a front mounted winch.
I agree with the idea of mounting a winch on your truck, I think it is an excellent investment. But I would advise putting it on the front.
2016 Colorado Crew Cab Z71 Duramax