Gidday Steptoey
Well now. It is a can of worms, as others have said.
My camper trailer expands to about 212 square feet of fully enclosed and floored living space, if I want to stay a while somewhere (I've been in smaller bed-sit flats ... ). This is more than adequate for just me, as I will almost always be travelling solo - my wife hates camping ...
Minimum size is just the bed platform on top of the trailer plus the ground floor room (and leave the annexe slung over the top of the tent roof, tied down, of course). This takes a practised bloke about 3 minutes to set up, and takes me about 8-10 minutes; another 5-8 minutes if I bother to put up the annexe. It's small, but more than just adequate.
The very first time I packed the annexe and tent away, it took me a whole 15 minutes. I expect to get better and faster at this ...
.
Folded up, the whole thing is just narrower than my car, with the wheels being the same size and type with the same wheel nuts and the same track as the car ...
Off-road, there is nothing to break - unless I pack my coffee mug badly ... There is also nothing that can hang up, snag, bend, scratch. It is a general purpose box trailer. Nothing flash, but all but indestructible.
The top of the camper tent is the same height as my rear window. So it has a very low centre of gravity. I can see over it easily, so no special mirrors that make the vehicle even wider. Trust me, I had truck mirrors on my old LC so that I could see what was behind my tandem axle, dual horse float. Never again.
It is small and light enough for me to manoeuvre and set up by myself.
I see the above as just a few of the reasons. One of the biggest is that so far the entire set up has cost me a bit over $5,000. Totally finished and equipped, this will still be less than $6,000.