Welcome to the club!
Sunline's "Manual" consisted of various manuals for the appliances, all put together in a binder. There was really no specific "Owner's maual" for the camper itself. If you need manuals for your appliances, you can look in the files section of the site. There are links to everything you might need.
You won't find too many Sunline owners online this weekend... The annual meet and greet is this weekend, in Mexico, PA. There are lots of Sunlines here! Unfortunately, I haven't seen any Sunline truck campers here.
Please feel free, to post pictures of your rig.. We love pictures!