It says you can order a matching lock set to make the door and cam lock keyed alike.
in Oregon
Teardrop Fix-It-Shop reproduces exact replicas of Kit and Kenskill Teardrop Trailers and supplies aluminum extrusions and moldings. These trailers are available as a pre-cut do-it-yourself kits or can be built to order. Based in Victor, Montana.
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Another one in northern California, but offered as kits. Only 4' wide though.
Might be an option, but not thrilled with the profile.
Links to http://www.monkeytailportablesanitation.com/ which is in Florida?
California kits, bad shape; no shipping available for the aluminum skin