Originally Posted by bradv
A screw should be able to hold that. You will definately need to drill it out first. Then if you want to use tef gel to go on the screw. that will help (a little) with corrosion from dissimilar metals.
If the manufacturer had installed it, they would have used screws.
You may be able to use sheet metal screws, but I think I would drill and tap the trailer for machine screws (the metal should be pretty thick, a little too thick for sheet metal screws).
If you're worried about corrosion, spray cold galvanizing paint on the area after you drill and tap the holes. After it's dry, install the pads using a good sealant on the screw threads.