It's your idea, so I think you volunteered to do it. You're right, logically speaking, it's not too difficult of a concept. There are tons of resources on the internet that could help you choose what parts to use, and how to hook them up. I would suggest trolling around on 12Volt.com a bit, and of course Google will return a number of alternative options as well. Of course, you'd build your prototype on a test bench just to make sure it works the way you planned, then figure out how to install it in the truck.
I think you can do this man, just have to put the work in and break it down into smaller pieces. Then put the pieces together into the whole mod. That was the approach I took with the dome lights, 194 switchback polarity changer, and power folding mirror logic. :twocents