I'd be very surprised if the units themselves are at fault. Given the number of failures I'd have someone that knows a lot more than I do to start looking at the installation (venting, electrical supply, etc.) that are common to all of these units to figure out what is going on.
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2018 Jayco 28RLS
2012 F-250 6.2L 3.73
Equalizer Hitch
Yamaha 2400ISHC
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