The you and the dealer should have done a walk thought,
if the sales person didn't know what was what, then he
should have ask someone to find someone who could tell you
how things operate.
Your dealer may be friendly but he has fallen short on
helping you. There is a ton and mean ton of posts
regarding PDI's and what to ask about the operation
of a TT or 5th wheel........
Please understand I am not blaming you for the lack
of the dealer, but what I would do is call the
manufacturer and ask the questions and if they will
sell you a manual for your unit.
Do not be shocked when you get the manual if it not
only covers your unit but 6, 7 or even 8 different
models of the same brand. How ever it should cover
stuff like the inverter, frig, stove etc even thought
they are made by different manufacturers.
What you also might do is to fill the gray water
tank by running water into the sink for a few minutes
and then pull each of the levers to see which one
is the Gary water, (my thinking it is the left lever)
again make sure you either have a hose hooked up
or if not don't stand in from of drain
Once you know what the gray water lever is make
sure it is completely empty and the value is closed.
Then flush the toilet (make sure no one has used it
and is clean ) for a few minutes and then pull the
level that is opposite the Gray water tank (my
thinking it will be the right handle).
Maybe I should have stated that you should have
the cap off the drain tube.
Warning do not stand in of the drain tube you may
get very wet. What you might do is attach a drain
hose to the drain tube like you were going to empty
it at a dump site.......
As far as the inverter mine will switch on and off
depending on shore power or boon docking so I do
not even think about it, of course yours may be