In Australia this is the most popular style - slightly shorter than we'd expect with the roof that pops up.
Jayco is one of the leading manufacturers from what I saw.
I am not sure why this style is so popular.
They also had some awesomely tough looking ones for Outback use.
Most 'caravan parks' didn't have 50 amp service and most trailers didn't have AC.
We rented a tiny minivan conversion. It was the trip of a lifetime.