I suggest testing everything you hope to do, very close to home first. Live in your camper -- totally -- for a week or two before leaving home. I began by living in a mock van in my bedroom, which taught me a lot. When I got my real van, I lived in it parked in the driveway, day after day, which taught me a lot more. Some examples:
(1) A showerhead made for the high pressure of sticks-n-bricks only dribbles in the low pressure of RV water, you need a showerhead
made for use with the pressure of a 12v pump.
(2) I don't know how people get by with freshwater tanks on the outside. Don't they freeze? I keep my 20 gallons inside with me.
(3) When temperatures outside drop into the teens, the furnace empties propane tanks in a day or two! *Gasp* After that experience, I began lowering the thermostat at night to around 43F, and wrap
this 12v mini electric blanket around my chest while I sleep, keeping me toasty warm. It only draws about 1 amp of house-battery current.
(4) Use a powerful garden hose sprinkler to spray the outside of your rig
everywhere, with someone inside to watch for any water coming through. Discovering and fixing leaks under a shining sun is so much easier than discovering your whole rig has turned into a shower during a week of pouring rain (as has happened to others), because you can't do anything about it until the rain stops.
(5) Avoid going back into your house to use the toilet. I made several discoveries that way: (a) My Gama Lid seal leaked terribly when it tipped over, spilling melted brown across the floor right through the "seal", but (b) I had put white vinegar in the bucket first, so there was no bad smell when the spill happened. Everything had dissolved and become ordinary mud. (c) So I found I do
not need those dangerous/harmful chemicals, as white vinegar does wonders, and it works equally well in the pee jar. But the white vinegar didn't know when to stop. It melted right through the metal grill I'd placed over the vinegar to support the bags of "yuk". (d) So those bio-degradable bags then sank down into the vinegar and dissolved as well. (After that experience, I got a grill made of better metal, and no longer trust those bags to stay together.)
Anyway, that's enough for starters to give you the idea. Try
everything you plan to do first; I mean
everything, even if it seems "silly". You'll learn things you never would have thought of, and will be in a position to easily jump back into your house and start over. Also, don't worry about getting "The Knock". People talk like that's something to dread; I don't know why. Interestingly, I got my first "The Knock" on my first trip out, during full daylight, to the local shopping mall. It was the mall's security guard who used the standard bam! bam! bam! on my wall. He was smiling and very polite as he told me I have three hours to be on my way. I politely thanked him and was on my way the next hour. No big deal. And actually, my partner and I laughed about it a lot.
Only out on the road
one hour and already got "The Knock"!
Hahahah!