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When I bought the RV I was given a ring of keys but none of them operate the lock or dead bolt on the camper door. Can they be re keyed or cheaper to buy new locks?
The door lock fell apart at the Q Rally 2 years ago, and I'd guess the mechanisms would be identical. It isn't cheap, but I'd recommend replacing the lock, and throw the old one in your spares as you likely will need parts from it.
A competent locksmith can hand fit a key to the lock, generally for a lot less than the cost of a new lock assembly. It would likely be cheaper to remove the lock and take it to the locksmith's shop, rather than have him travel to you.