You can say "go camping", meaning light trip outdoors, more like a picnic. By what about serious trips across tundra or some uninhabited land, with a heavy backpack?
In short, is there a word for "hard trip outdoors"?
"Backcountry" camping is what I would use to describe remote or hike-to camping. It's also the terminology used by the U.S. National Park Service to describe their hike-to, "backcountry campsites". It doesn't suffer the same ambiguity as "backpacking," which could also describe almost any kind of traveling where you carry everything in a backpack.
This is often known as Yomping.
This term is used for an arduous journey on foot across wild territory.
The word was originally a slang term from the British Royal Marines but came into wider use in the 1980s as the Marines famously yomped across the Falkland Islands.