Scott, thank-you for the info, that was an interesting read. Moving the receptacles to a higher elevation is not an option for likely 90% or more. Most are mounted on a concrete wall not much higher than 36" (this applies to the interior walls as well). Obviously there are concrete pillars but the distances in between would be impractical. IMO an easy solution to help increase the life of the receptacles would've been to use self closing weatherproof covers (the type that snap shut when when you release the cover). As I was testing the receptacles almost every cover was open to the elements. Nobody is closing the covers after they remove their block heater plug ends. The top level receptacles which are exposed to the sun look "baked" and are likely brittle.
If it were up to me I'd revamp the whole works but instead I have been instructed to fix the non-working/damaged receptacles only. It will forever be a high maintenance area until too much breaks down all at once.
