Replace the storage CH751 locks/keys with same as your door key. Everyone has a CH751 key.
http://www.rvlocksandmore.com/Global-Link-and-Fastec-FIC-Brand-RV-Locks-and-Keys/Security-upgrades/CLB-Cam-Lock-Barrel#.WG64Bn31-aU
http://www.rvlocksandmore.com/Global-Link-and-Fastec-FIC-Brand-RV-Locks-and-Keys/Security-upgrades/CLB-Cam-Lock-Barrel#.WG64Bn31-aU