Turn off the breaker before pluging in the cable. If the power pedistal doesn't look new, test the wiring with an outlet checker you can get at a good hardware store. You'll need an adapter to get from 30 amp to 15 amp in order to plug the checker in. I have a checker more or less permanently attached to an adapter for this purpose. About $8 invested.
When the connectors arc, carbon is built up on the lugs. This interferes with a good connection which causes the lug to get hot. If you suspect the outlet is corroded or carbonized, plug and unplug the cable 5 or 6 times to clean things off a bit. (Breaker turned off)
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2008 (or is it 2009?) Rockwood 8280SS - 2007 F-150
Lot's of mostly Kenwood radios