We just returned from 2 months in Ireland and the North Atlantic side by the peat bogs are famous for Midges ( a slight variation on the bug discussed here )Anyway the Midges didn't seem to be able to get through the screens and the camping car vacuum would suck them up, Now in Labrador with the black flies we had no Electricity so we suffered, and the no see ums in Maine was also bad.
But I have to agree the chiggers we encountered in Maryland were the worst.
Happy RV ing moments we won't forget.
Aloha from Kauai
Leon