Yeah, bad year for the Asian beetles. They live and breed in soy beans, and when the beans are harvested, they flock to find warm places to winter in. Of course that happens to be our trailers. I have the same issue myself, across the road from my house was a soybean harvest. They got up under the roof seal on one slide, so when I closed it, they got transferred to the inside. Needless to say when I got to the campsite and got all set up, the interior was loaded with at least 600 or more. I vacuumed them up and had to dump the container several times outside, and it was filled each time.
Once one finds a place to camp in, they send out pheromones to let others know and they flock to it. So cleaning them out is only temporary, keeping them out is the hard part. Google Asian beetles for answers on how to eliminate them.