The $20 Supco works just as well for me as a $350 unit. I've bought dozens of them since they came out, probably in the 70's.
It just makes some guys feel so good to buy an expensive device, that does the same thing.
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Sold RV.... downsized to a 6x12 cargo trailer with Starlink and mini-split A/C. Easy to tow at 1200# - real happy now.
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