Resistance generates heat. So you had too much corrosion or looseness between your plug blades or connections inside the plug or socket.
To address your latest no power issue, first check your Hughes plug for damage and call Hughes. It sounds like you still have not power w/o the Hughes device, so the issue is with the RV power cable or wiring system. As someone said, I would check continuity of the cable and wiring going to your distribution panel in the RV.
2019 Hemisphere GLX 314BUD with Goodyear Endurance tires
2019 RAM 2500 6.7L Cummins SRW
Husky Centerline WDH/Anti-sway
TST 507 TPMS
Dual Honda EU2200i w/extended run tank