I recommend downloading the technical bulletins for your particular system. I know mine doesn't follow common logic. It has a dipstick... that isn't used....
No marks on the dip stick, no reference to it in the TBs.
TB says with jacks retracted fill to top and cap. Done
"Cracker Box" 2007 Jayco Greyhawk 33DS on a Chevrolet C5500 Kodiak
"Yellow Hammer" 1982 Jeep CJ5 V-8 4x4 Tow'd