This suffix signifies the act or process of something, in this case, the act of setting up a camp.
Other possible suffixes are less common and might not be immediately recognizable:
* -er: While not directly related to "encamp," it could be used to form the word encamper, meaning someone who sets up camp.
* -ing: This suffix forms the present participle, "encamping," which refers to the ongoing action of setting up camp.
Ultimately, the best suffix depends on the specific meaning you want to convey.