Not only did I not know that, I don't have a key. I did not want to have to take a window off right away, so the only way into the trailer was through the back hatch, which I had removed last week.
I felt pretty squeezed going through there, but I got the door open and a lesson was learned.
Then it was onto the skin removal. Most of the screws on the trailer are 1/4 inch hex, and my dad gave me a special drill bit to remove them. However once in a while I would find a 3 or 4 inch screw that the previous owner had tried to use for repair.
When you take the aluminum skin off of a vintage trailer, the first step is to remove the trim along the edge, also called the j-rail. This sits over a layer of putty, that was used to seal the seams. On a trailer this old, the putty is degraded and dried out. It is no wonder these old trailers have water damage.
I won't know the extent of the damage until I remove all the skin, but it is likely there is some.
Once the j-rails were off, I cleaned the putty off of the inside, carefully labeled them and then scraped all the old goop off of the edge of the trailer. You can see a close up here of the seams after the rail is off. There was even one small spot on the trailer (shown below) where the aluminum had a small piece missing. You can imagine how easy it is to damage the interior if any water gets past that. I will be very carefully sealing that hole on the reassembly.
By the end of the day, I had all of the rails off, the sides scraped and the front window guard removed. Next week I will
start the windows.