You have a short somewhere in your brake wiring or a magnet in the drums. You need to ohm the electric brake connector to ground at the 7 pin trailer connector. Should have around 1-2 ohms. If higher you need to go thru the wiring and then to each wh...
I'd at least put a surge suppressor to protect on board electronics.A better device would be a https://www.amazon.com/Progressive-Industries-Hardwired-Electrical-Protection/dp/B003AN1UA8/ref=asc_df_B003AN1UA8/?tag=hyprod-20&linkCode=df0&hvadid=312094...
vents like this?? https://www.etrailer.com/p-372GRILL2D-A.html?feed=npn&gclid=Cj0KCQjwvo_qBRDQARIsAE-bsH_f4mh0iBF88KwEmNZZUUTSFvSf0qt9jVVuEpbW3ZfOLu3fq970GMcaAhghEALw_wcB
The AC you have now is a ducted AC. The 2nd one you want will be a non ducted. https://www.rvpartscountry.com/Dometic13500DuoThermBrisk2TopUnitOnlyAirConditioner.html?gclid=Cj0KCQjwvo_qBRDQARIsAE-bsH_y6y8TO27fRqzIbbX67wOiIEg6pu0zWMxjeR7wj9RmNfMRfSoy-...