In the teardrop I built I installed a pair of twist lock cord ends to make it easier to roll up the power cord. I found this recently and wish I found it then. I am going to install it on out pop up. Will make hooking power up a lot easier. I tried to ge t a better link, but if you copy and paste the last sentence it will come up with a few choices.
Hubbell 30 Amp 125V Square Plastic Shore Power Inlet