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My guess is a bad wheel valve. I had the same issue once. It ended up being a bad wheel valve. Trace which dump valve it is then you have it narrowed down to two wheel valves.
Bad hub seals tend to squeal.
" When I went to inflate, there was a very high pitch squeal coming from the rear duals area, but no air from the dump valves " Air is not supposed to come from the dump valves when inflating.