Part of the reason is security - you pull in to a rest area and you are absolutely self-contained, you don't need to exit the vehicle, so even if there are lions and tigers and bears around (or Judy Garland impersonators) we wouldn't have to worry about them.
It'd be particularly useful up north. We were up at Karumba dipping our feet in the Gulf and the operator of the caravan park told us to be careful, because they'd seen a salty in the area just a few hours before we got there. "Big one?" "Nahh, maybe 4-5 metres".
Nope.
Nope.
We actually risked it, I drove the Nav right up to the closest spot we could park near the water, checked the shoreline left and right and noticed some fishermen about 400m west of us. I thought they'd probably be more appetising anyway, so after scanning the water we decided to quickly head for the sandy/muddy shoreline and get the photos, constantly vigilant for anything moving in the water.
We'd like to travel more through Kakadu and also around to Exmouth from Darwin (Fitzroy Crossing etc). The motorhome just seems so much more sensible in those areas.
Gee, I could talk for ages about those areas. It was on one of the number of trips to Karumba, on the leg between Winton to Hughenden, that I almost managed to crack 30lph in the Nav towing into a stiff wind between 70-80kph. We would always stay at the Sunset CP at the point in Karumba and most evenings walk to the Sunset Tavern for dinner. Even managed to get our heads on TV for about 2 seconds when they were filming "Back Roads" at the pub.
Daughter and I would walk across the road from the CP to go fishing and loose our thongs in the sticky mud. Little scary in the dark but didn't see any eyes watching from the water. Couldn't keep the dog out of the water either although one day, saw some tourists swimming in there. I assume they survived.
There are a number of spots in Kakadu not accessible by 2wd.
My favourite was crossing Jim Jim Creek on the way to the falls. I did the creek crossing four times with the bow wave at bonnet height, while a couple of foreign tourists and I filmed each other (crossing the creek, not any of that Oooh la la). I had to winch out someone in a 2wd hire car that got stuck heading to Sandy Billabong in Kakadu.
Lots of locals hanging around at Fitzroy Crossing outside the CP. Unlike what is often reported, we never felt at all threatened but then we didn't free camp. Loved the gorge cruise at Fitzroy Crossing.
I wanted to stay at Halls Creek so we could travel out to Wolfe Creek Crater but wifie found the whole atmosphere in Halls Creek scary, not to mention that she was still freaked out by having watched the Wolfe Creek movie:
We took the van into El Questro Station and did a day trip out to Home Valley Station, crossing the Pentacost River. Lots of places where a 4wd is handy but it just depends how much you want to see or whether you are happy to go on an organised tour.
We stayed at Exmouth and met a couple free camping in their van on the beach near Ningaloo. They said the other campers had cleared out and they had the spot all to themselves. I was so envious.
Coral Bay is also a beautiful spot as is Cape Leveque.
Anyway enough from me.