First a motor home is a combination vehile. One part is a TRUCK and if you find out what chassis you have with the exception of the jacks, you need to find the manual for that model TRUCK or one just like it.. IE: A ford truck with the same engine and transmission if it's a ford. or Chevy for GM product lines (workhorse) or the like. You will be 99% good with that (Workhorse used a proprietary fuel filter.
In some cases you can further break down teh chassis to Engine, (GM in my case) Transmission (Allison) Drive Train (Dana) and rear axle (Also Dana, actually their other name in both cases).
And the house
Now I think you likely know how to tend the inside walls of the house (Same as Sticks and Bricks) and the outside (Same as your car) but then we have "Stuff"
Stuff includes Doors, Miroors (outside) Rear View Camera, Fridge, Water heater, Water pump, HEVAC systems. and so on. Tiffen did not make them. they bought them.
SO you go on line and google: Make, Model, Manual (Make and model are repalced with the make and model IE: Dometic 1122x13x (made up model)
In some cases (my Dometic Microwave) you need the real maker (mine is a Unlucky Goldstar (Well Really Lucky Goldstar (LG) but I've never been lucky enough to have a goldstar product that worked as advertised, Though mine does now,, I had to do some re-engineering on it, replace one part with a GE part and so on).
Then you will have all the manuals
STUFF INCLUDES THE JACKS.
To your question.. Mine say to have engine RUNNING (Try your jacks that way) as the Alternator helps the chassis battery to jack 'er up.
But other than that I suspect the answer to your question is YES.
Transmission in PARK
Parking brake ENGAGED
on mine Engine Running for power
And down they go.