A minimum of a 4" x 4" hole is needed to pass the power connector to the outside. Recommend the 4 x 5" panel that seals the hole when shorepower not in use and covers the hole while allowing the cable to pass through when in use.
3 1/2 x 3 roller to roller. Works great pulling cord out, like all ports, you need to slow down rewind as you line male plug up to the port. Anyone with a 50 amp need these roller to give you easy unwind!