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)
(http://www.rvlocksandmore.com/camlockmeasure.gif)
Another lock set replacement are made by Industrial Lock and Hardware. TCL 1 1/8" - CP Tubular cam lock, I purchased them for 21 BHS.
https://ch751.com/
:) Thank you