DR3W, you can fit a double din radio into your truck, BUT!!!!!!! You knew that was coming. The trick is that the opening is truely a double din opening, but after about 3" into the opening, part of the dash interior protrudes into the radio area. This makes it so a Din and a half radio will only work. But, if you pull the plastic off from the dash that goes over the radio, you will see that the plastic is not supporting anything and that you can cut this plastic out and give yourself the room to fit a double din radio. I recommend removing the plastic above the radio for the dash as there is a wire that runs up there and I would hate to see you cut a wire bundle and then have to fix that later.
I've had a double DIN radio installed in my truck in the past. I had the Pioneer FHM-75. I loved that radio. ONly radio I know of that had karaoke in it.
Any questions, give me a shout. The hardest part of this will be finding a mounting kit for that radio. I know I ended up using plumbers tape to make my mounting. But, that was 12 years ago when I did that install, so, maybe someone makes a kit now.