He let himself out of the trailers. I guess kids that age can do that. My dad said that when I was that age and we were living in Germany where my dad was stationed in the army, he said I was constantly climbing the front yard fence at the house and trying to run away down the street..........
Sounds like a normal 3 year old to me...
Yeh, he's normal!! All kids try "the great escape" at some point!!