What I did is to use silicone rtv sealant in the holes. Then pit the factory screws back in. Wiped off the excess sealant and painted with touch-up paint.
Your trac being dark colored should not show as much as my silver.
Like "fast eddie", I just put silicone on the threads and put the screws back in. This way it looks more "truck-like" to me and I can put the rails back if there's ever a need. The screws are not noticeable after a while.........