Oldav8r

Thanks to all for your responses. I know some of this is pretty basic. 

We are complete rookies right now. We're am borrowing an 2017 Freelander 21RS from my in laws. We've taken one short trip of a couple days so far. I am baffled by the fact that there is a full owners manual covering the vehicle but almost nothing on the operation of the "house."  My FIL is just as clueless as they've only used it a couple of times. 

Current issue

The water hookup. Fill v. City valve position I think I understand. Go to the campground place it in City and hook up their water. Fill seems straightforward as well (except how do I know when it's full?) 

What is confusing is the rest of the instructions - especially the CAUTION. 

 - 

What is the Fullway Termination Valve? Is this also the valve I shouldn't depress under pressure? 

 - Is the toilet the only way to get water into the black tank after dumping ? 

Thanks for any help/