I had to pull the troop seats out on one side of my truck this afternoon. This is an M35A2 with a regular bed, not a "c" model with the drop side bed. I picked up a load of horse manure and the guy who loaded the truck did not leave enough space when he dumped the stuff out of the front end loader on his tractor. He almost crashed through the seats.
Anyway, this is best done with one person at each end of the seats. My sides are hooked into the panel behind the cab. In order to get the seats up, I have to first get that hook off. Sorry, I don't have a picture but if you look you'll find the hook I'm talking about.
Once your sides are clear of that hook, both people should lift the seats up. Having two people not only helps with the weight of the seats but also allows more control. The seats need to be lifted straight up. They bind when you try to pull them up at any other angle.