Then you have the physical size to deal with out on the road, parking, etc. I see people in the US with these giant motor homes and 5th-wheel trailer homes trying to navigate the national park system, petrol stations, RV parks, narrow scenic roads, and...
Finding a suitable vehicle is incredibly important. It's a large industry in Australia, we have the world's longest national highway. Highway 1 does a full lap of the country, 14,000 Km.
A lot of people dream of doing a full lap in their retirement but of course by that stage in life they're used to comfort and have health and lifestyle considerations as well. Many of them spend their life savings on setting up their idea of the dream mobile home. Many go broke well before completing a full lap, some go broke before they even leave home.
And if you want to leave the main highway and visit some of the more exotic places in the country then you need a vehicle that's capable of doing so. 4WD is not the only consideration here either, any vehicle built after the 1990s is also unsuitable and unreliable in much of our country because of all the electronic crap in them.
The engine management systems are fine, those things are near indestructible, the problems are to do with the antitheft and engine immobilisation software. That has caused more than just a few deaths in Australia, get stuck in a truly remote place and it could be years before someone stumbles across your bones.
Most reliable and suitable vehicles for this are Toyota Troop Carriers from the 80s and 90s. There's quite a large industry keeping these things running in Australia simply because these days it's impossible to buy a vehicle without all that electronic tat.
And if you're not the adventurous sort that's going to go wandering through those sorts of places then don't go wasting your money on a heavy lumbering 4WD that's going to cost you a king's ransom in fuel. Keep it simple, a station wagon with a tent and a couple of swags you can throw on the ground is all you really need, it's not like you're in danger of freezing to death except in our alpine regions. Or in Canberra, that place is always really cold.