Need additional info to get the correct answer for you... The SHORE POWER Electrical Cord is a very important SAFETY feature for your trailer.
It must have three wires - A 30-AMP trailer will have One HOT - One NEUTRAL - and One GROUND... Keep in mind the Shore Power connection at the Camp Ground Pedestal is how your trailer gets its FRAME GROUND to prevent Electrical shock when touching the metal sides of the trailer.
There are two STANDARD ways the Shore Power Cord is installed on your trailer.
One is a pull-out cord that stays connected to the 120VAC Distribution Panel and is installed in a small compartment where you push the cable back into it when disconnecting from Shore Power. The access door may look like this
When you push in your Shore Power Cable there will be enough room inside the access door to allow your 30AMP Cable MALE end to be stored with the access door closed.
The other method is Permanent mounted MALE PLUG on the side of the trailer behind a small access door which will look like this.
The typical 30AMP connection for your Shore Cable is a standard RV Twist lock connection.
This 30AMP Cable is able to be disconnected and stored inside your cable when not in use. Available from RV Parts locations.
Also NOTE you will find a INFORMATION DECAL around these access doors identifying what 120VAC Service your trailer is wired for.
Both these methods are the APPROVED SAFE METHOD for providing 120VAC Power to your trailer. These cables are usually around 25-feet in length and mounted on the drivers side or rear of your cable so that the cable ends will plug into the standard 30AMP SHORE POWER PEDESTALS at the campgrounds.
This is a typical wiring diagram of the Camp Ground Pedestals
This is a typical SHORE POWER CONNECTION Panel at the camp ground.
Some camp grounds may only have a 30AMP Connection Shore Power Cable Pedestal
Please submit which method you are asking about.
Alot of comments on here about different ways of using cheap WALMART brand extension cords to get connected to the 120VAC Power source but I suggest you do the proper manufacture's method for this first SHORE POWER 30AMP Power Cord installation. Your dealer should have provided the proper 120VAC Power Cord for you to use.
Non standard connections will get extremely hot on you being plugged into 30AMP Service connections. Plenty of burned up adapters and extension cord head connections on Google Search to view...
Don't short change yourself in this important SAFE 120VAC power connection. It could be your kids that get shocked.
Just saying...
Roy Ken
My Posts are IMHO based on my experiences - Words in CAPS does not mean I am shouting
Roy - Carolyn
RETIRED DOAF/DON/DOD/CONTR RADIO TECH (42yrs)
K9PHT (Since 1957) 146.52M
2010 F150, 5.4,3:73 Gears,SCab
2008 Starcraft 14RT EU2000i GEN
2005 Flagstaff 8528RESS