I have had good and bad luck with items you've repaired and upgraded. Some of those issues were operator error and other's manufacturer workmanship of an appliance or just age. There aren't really any owners manuals other than those provided by vendors. A few specs or description of some systems are explained by Chariot. I think they assumed most owners would have previous experience with RVs or just tell a shop "just fix it". Help from the factory when it existed was great. I got some help from Gold Rush at first, but they don't return my calls now. I, like you, would like to get some of the design or one-line drawings. I was told, not by Chariot, manufacturers didn't provide much because of design secrets. We live in such a patent world.