Try using a big center punch with a decent sized hammer. You place the punch on the edge of the head of the screw and strike it with the hammer at a straight angle to it. After you have a good impression of the tip of the punch, put a slight angle on the punch and strike it in the direction of removing the screw, counter clockwise. Continue striking until you have the screw moving about a quarter of a turn. By then you should be able to remove the screws either by using a #3 philips, or use a pair of vice grips to remove them.
Hope that helps.
If you want to ease the removal and re-installation of the doors after you have the hinges removed from the truck, you can take a 4" grinder with a cutoff disc and cut the hinges. If you look at the main part of the hinge, there are three parts. You need to cut the hinge about 1/4" down on the middle section. Then you have to cut down the side of the same section to match. The reason you end up shortening the center is to help clear the portion of the fender and cowling near the hinge that sticks out. After you are done with the cutting, use a file and round off the edge of the pins and the outer body of the hinge. The pin, to help with alignment for re-installation of the doors, and the outer to just clean up the appearance and remove the sharp edges. Then you paint the bare metal using the touchup paint that is similar to the color of your truck to prevent rust.
Gee, can you tell that I've done that before?
