Most of the time it’s groups of 2 (unless we’re talking about municipal development, which is a different beast altogether, I’m thinking firms that do lots of out-of-town work), but often you can be in camps as support. Frequently, there will be a team working a big project on rotation, so lots of opportunity for shared experiences.
Admittedly, my experience in rugged coastal mountains isn’t going to be the same as those that are working in dense urban environments. I assume because OP is talking about camps that they live in a place that offers reasonably close proximity to wilderness.
Also, you have to have a fairly high interest in math and the outdoors to stick with the profession.