I remember when I owned a Coleman PU, I found out that everyone had the same key. Not that a PU was real secure to begin with...
I like the dual locks on the TT's two doors. Each door even has a different key. I placed a piece of yellow tape on the key to the main door so I don't have to figure out which key goes to which door each time. Regarding the storage areas, I don't store anything super expensive in them.
When leaving the TT, I try to hide anything of value such as electronics.