in the past 14 months i have had to replace the 30A plug that plugs into the rv parks box at least 3 times because 1 of the prongs overheats and melts my plug. need ideas on what might be the cause
Yep, the problem is in the cg's receptacle. If the contacts in the receptacle are not making good contact on both sides of each of the male prongs it is generating heat and will cause the problem. Sometimes folks will tell you to bend the male prongs out so it will fit tighter in the receptacle. That is totaling incorrect and will just compound the problem.