I hate to pile on, but what is the point we are trying to make?
Yes they make truck campers and off road camping trailers in America too. Are you asking which on is better? That Hilux looks like it would die on a rough dirt road, even without the camper. That trailer looks like it would cost three times the camper on the Hilux.
I went with a truck camper because dragging a trailer up a logging road into the mountains and discovering the road ends with a steep mountainside on the left and a steep 200 foot drop in the right and no where to turn around makes pushing a trailer backwards down a mountain for a mile pretty crappy.
Even my overly large truck camper can be backed up, parked in a typical parking spot and driven on forest service roads, over miles of washboard and around switchbacks with only a moderate amount of concern for low trees and branches.