My motorhome had the universal, infamous CH751 keyed locks. I found a spare key in my keybox from a different “toy” of ours, and rekeyed the motorhome locks to match it, so the motorhome locks no longer accept the CH751 key. You can buy wafer kits and reconfigure your locks to match a different key, as long as the key is the same style that fits in the cylinder slot.
Or, you can just go to a company like CH751.com and buy all new locks and keys for your motorhome basement doors. https://shoprvlocks.com/