The frame of my trailer is steel and the skin is aluminum so both materials are very well coated. I'm not planning on putting holes in the skin, but wondered about welding vs. drilling over the thick painted coat.
I want to add a few hooks for pads, extra halters, etc. Nothing very heavy.
\"Let the civilized world go to the devil! Long live nature, forests, and ancient poetry.\" --Theodore Rousseau
I don't know if you've perused these, but I just put new saddle racks in my trailer using the rack systems at Organized Barn and Trailer (you can google it). They are totally and completely awesome and once you have the back panel up, you can add and rearrange however you want. Four hooves up!
I used the 3M stick-on hooks of various sizes for my tack room and they are working well. I even used the 3M picture hanger strips to hang a small mirror on a wall. Obviously doesn't work if you need to place hooks on a carpeted wall, but great for everywhere else. I use them to hang helmets, show coats on hangers, spurs, etc.