Welcome to iRV2. On our 87 Southwind, all the basement doors are keyed the same. The gas cover is a different key and the drivers door is another key. Anyway, you get the idea, just get a lock smith and he can make you keys in a jiffy. Not inexpensive, but the only way I know to do it. When we got ours, we had all the keys, so I went and had an additional 3 sets made, overkill granted, but now I do not have to worry if we lose a set (read that as wife strikes again
), I have plenty of backups.