As has been mentioned and you have already found out, the owners manual for the Sunnybook trailers, and most other manufacturers, are very generic.
You can download the manuals for most of your appliances and other things in your rig from a site owned by one of our members Chris Bryant. He has a RV repair business in Florida and has been very helpful to many of our members including myself.
Appliance manualsHope this helps you out and you enjoy your fathers rig! :) Sunnybrook built the Titan models very well and to last. Ours is the same year as yours, still looks almost new, and is going strong. :) Too bad they sold out to Winnebago.
Barney