Camping w/AC200L

Question: I bought the AC200L to plug my camper chord into for Dry Camping. Bluetti support is telling me if it rains, the unit needs to be brought in the camper. For anyone that does camping, you are aware of the thick heavy cable. Are you running the camper cable into your camper to plug into the AC200L? This doesn’t make sense to me. What are people doing?