One of the greatest hazards at an RV park occurs when you plug your RV into shore power.
The Conntek Cruiser Power Supply Cord ($80) comes in 25 or 30 foot long versions, and uses a standard NEMA TT-30 fitting, but with an improved design.
A larger surface area inside the plug allows for a better electrical contact between the shore power pedestal and the power supply cord.
Better electrical contact reduces arcing and heat buildup, and helps prevents a fire from occurring.
A small blue LED light on each end of the cord alerts you when power is flowing through the cable.