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This fix cost me $4.99 for the foam, and took about 30 minutes from start to finish. It should take less time after reading this guide.
Basically, I unhooked the leather seat cover (the steps should be the same for cloth seats, but I have not verified it) and taped some additional latex foam padding onto the seat frame (the particular part that makes the butt hurt on long trips).
This is the foam I used for the job. It is 1/2" latex foam rubber, which can be found at any hobby shop in the R/C plane section. It is commonly used to wrap the R/C receiver to absorb vibrations.
Here are the tools required for the job: Standard phillips head screwdriver, foam, duct tape, scissors. NOTE: The dirty floor pictured is not neccessary for successful completion of this project.
The first step is to remove the two screws in the panel on the left side of the seat (toward the door). You will also need to remove the screw from the center of the recliner handle, in order to remove the panel. Once removed, you should remove the clip that holds the front of the seat cover on. This clip can be removed by simply pushing down on the front of the seat (to relieve pressure) and then pushing back on the clip (toward the rear of the truck). NOTE: The seat cover is attached to this clip, so don't try to remove the cover from the clip.
Next you will need to remove the two smaller clips on the left side of the seat. These can be hard to see at first, but they are down at the bottom of the side of the seat, attached to the fibrous material that holds the seat cover on. Push down on these clips and they will pop right off.
After all of the clips are removed, the seat cover should easily lift to reveal the seat frame. NOTE: If seat cover does not lift easily, do not force it--look for other clips holding the seat cover in place.
Simply tape the foam over this frame to relieve the pain in your butt. I chose to fold a section of my 1/2" foam to equal 1" of total padding. Make sure you get enough foam to cover most of this frame rail. Also, you will want to sit on the seat with it disassembled to test the amount of padding before reassembling the seat. NOTE: Tape does not stick to this metal very easily because it is coated. You may need to use extra tape as seen in the photo to secure the foam.
Then just re-attach the clips, and screw the side panel/recliner handle back on and you're done!
If you have any other questions, please feel free to email me.
Please understand that I take no responsibility for any part of this fix. I am providing this page simply as a guide so that you will know what you're getting into before you start the project.