Camera-trap photography is a gear heavy photography, according to me. But the good part about this is that you can use pre-owned or used/second hand gear to get high quality images. Even an entry level DSLR Camera body and a wide-angle lens can be an effective gear to start off your camera trapping journey. Part of the reason to use these used or entry level cameras and lenses is because most of the time, your camera will be out in the field, facing the weather, dust and not to forget curious animals or humans. Thus there is a risk of losing gear to adverse weather conditions or to theft. So it is best to use cameras that you’re ready to lose. Then you need the right motion sensor to trigger your camera when an animal crosses paths with your trap. I personally rely on Camtraptions PIR sensors to trigger my cameras. Along with that you need external flashes for lighting, various cables or wireless triggers to set all these things off, and a protective cover or housing to secure your camera and camouflage it in the field. And this is just the basics. Once you dive in depth, you will be accumulating a whole lot of additional gear.
Personally for me, it is very important to choose the right gear for my work, because it decides if I will land the perfect shot or not.