Yup there are no water shut off valves anywhere on the water lines unless you install them yourself.
Our toilet foot pedal sticks open once in a while, unless you let it snapback. I just use my toe and lift up on the pedal. Just make sure the water stops running into the toilet once you use the foot pedal.
YES - if the water valve actuated by the foot pedal sticks open just a little and lets the water trickle, eventually the black tank- WILL - fill up and the toilet bowl - WILL- run over inside the RV ! You will have a giant toilet water mess in the bathroom and down into the interior of the RV like storage compartments.
When you have visitors that are not familiar with RVs, It might be a good idea to maybe post a small instruction post-it-note sticker on the toilet lid, or tell visitors to your RV how to use the RV toilet. You would think it's a no brainer, but ask me how I know !
Always, Always, Always - when leaving the RV for an extended time - shut off the water supply to the RV !
If you have a pex line, hose, pex connector, faucet, whatever start leaking while you're gone, you will have a mess to clean up! Also if you have a tank type water heater consider shutting off power/propane to the water heater. If it empties while you're gone, the heating element will burn up.
I need to take the pedal off and get in there and use plumbing grease on the water valve and flapper valve. Actually I need to change the flapper seal also.
Be careful how to reattach the foot pedal ! Make sure the ear tabs on the water valve and flapper valve line up correctly with the foot pedal indentations. If they are off you could snap off the valve ears that go into the foot pedal the first time you use it.