I replaced all of my cargo area locks with a set from these guys -
CH751 RV REPLACEMENT LOCKS, CAM LOCKS, CAMLOCKS
They had a lot of options to get exactly what you want. I picked the kind of locks that are used on vending machines, (tubular cam locks) you can customize the keys so they have a colored 'handle' all of mine are blue now, just makes it a little easier to find the right key when you have a ring with several on it. Just don't forget the key for your outside shower... I have to carry my original key around *just* for that. I'm ordering one more lock, keyed the same, this week. Fast shipping, etc.. I'm not affiliated with them in any way, was just very happy with their service. They make getting the exact - correct lock pretty easy. You are just guessing with most of the lock sets on amazon... there's more to it than just buying a set of locks.. you have to measure a few things on your originals. I still wouldn't trust these locks fully, but knowing that *your* key won't just grant you easy access to my storage was some peace of mind. Some of the dealers are pretty lazy and they just make copies of the master for customers that have 'lost' their keys. That's one of many ways the master keys get into the wild so easily.
ETA - I have not and probably won't change out the other key that operates my door and deadbolt. I took a few lock picking classes years ago. Honestly, a decent screwdriver and someone could open any door they wanted in an RV. That deadbolt is about the size of a pencil eraser lol.