All you really need is the manuals for the chassis and the appliances, e.g. water heater, furnace, fridge, etc. The appliances are all standard models bought from companies like Dometic and Attwood and manuals are available for them online or from other Rvers who will all have the same or similar models. As for the chassis, do you know what make it is? Freightliner and Spartan chassis stuff is available online, but if it has an SMC Magnum chassis you may only be able to get engine (Cummins or Caterpiller) and Allison transmission manuals. That's probably enough, though.