Who's going to say, prove you're a guide? You camp in one site for it's limit then move to another campsite or campground using the same ramp. You invite family, friends, neighbors and campers to spend a day fishing. You're on the water most everyday. You might ask them for the launch fee to help with gas, might split the cost of minnows. Most likely after cleaning the catch it's sent with them or a campground fish fry.

The officer will see your trailer in the parking lot most everyday. He will see you with a different person each time. Likely to use your equipment since it's on the boat and set up the way you like to fish. If he watches you at the campground he will see the person leaving after the fishing trip with the catch.