do the rounds of the local caravan parks and I am amazed at the number of off road campers that are 'camping' in a caravan park. All come down to what you can afford and use
Based on my observation at work (caravan park) Caravans have gone the same way as cars; they make big on-road vans, but the resale value and image isn't as good as the off-road van. See the demise of the full size wagon and boom in soft-roaders as a similar comparison.
When you look at Ford not making a Falcon wagon after the BAII (they had the Territory instead) and no Toyota Camry wagon (there's the Kluger instead) you can see the trend that I'm talking about. Even the utes do it - the Holden RA Rodeo high 2 and the Ford Ranger PX High Rider are 2wd utes that have the same ride height as the 4wd ute; I'm not sure you can get a 2wd low height double cab like you used to be able to from either of them.
Now if we take that to 'vans and campers, look at the rise of companies like Lotus Caravans and others; even Jayco have more in their outback style then the on-road by the time you look at the toy hauler and expanda range (I still see quite a few low riding expanda)
I had a family of 5 pull in yesterday with a renovated 1980's van that's probably done a couple of laps of Australia, weighs a fraction of the new vans of the same size and whilst missing some bits and pieces (washing machine and ensuite for example) it'll still get them on the go and out and about... In contrast I also had a couple pull in with a brand new 200 series 'Cruiser and a big off road van...