I think I will go with the rail bolted inside the frame using the holes that are already there. I use the truck to haul sand , gravel and bagged concrete for here at home for projects to keep from unloading and reloading my regular work truck. I have seen many late model trucks with the sag between the cab and bed from overloading.There is a normal amount of surface rust on the frame like any other work truck that earns its keep.I think if I balance the weight out inside the bed and not load to the extreme front or back it will be ok.I've worked out of these trucks doing masonry in past years and I know they are up to the job but this is added security for the age of the truck.(Just like me)