Fender bolts. Rust is not your friend. Did this just a while back. Jack up truck. Put jack stands under truck. Remove wheel. Cut bolt and nut with grinder and thin cut off wheel. Remember face shield. Marks are under fender. behind wheel. Good. Rust is every where. Not so good. Use hammer and punch to remove what is left of screw from bed sides. find more rust and project has expanded. And so it goes.
