If the flies are already inside, they may be breeding somewhere inside the camper. If you can't reach any success, I would slosh some bleach down the kitchen sink and bathroom sink just on the off-chance that it will reach the breeders before it runs out. Then take out all the linens, food, and so forth, open all the cabinet doors, and then put a fogger bomb or fumigator bomb on the floor of the kitchen and close it up tight. The gas will permeate almost everywhere and kill whatever is there.
Several foggers and fumigators are readily available, easy to use, and reasonably effective. Consider the ones from Raid, at WalMart, Home Depot, etc.
Bill
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