I had the same problem with ours. Went from Wisconsin to Florida last week. It
was 2800 miles round trip most of it was 90deg plus. Ran a generator to run the rear AC. The AC struggled to keep up. It was unbearable to not run the camper AC. I have a sleeper on my truck as well and had both the dash and the sleeper AC on max. I set a box fan up in the walk through area thinking I would be able to blow the cold air back when driving and that would be sufficient but not a chance.
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