Well my water pump was always surging until I put an expansion tank to cure it.
I used about 150 zip ties under the RV and inside. Replaced about 20 screws that were either never used or fell out.
Check the junction box for loose connections (the one under the RV where the generator hooks up to the 120 V power in RV).
Tighten all of the connections / Screws inside the fuse box (120 v + 12V).
I think your list covers all of the common problems already.
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2017 Axis / 25.4: Big Foot Levelers, Aims 1200 Watt inverter, Ceramic Window Tint, Full River AGM 6V batteries, Front Hellwig Sway bar / Rear Track Arm, Safe T Plus Steering Stabilizer, PD 4655 converter, Hard Wired Surge Guard, WEboost + WiFi Ranger, LED Headlights/Driving lights, TPMS, Surge tank, Tornado flush, Viair Compressor
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