I have often wanted a retractable shore power cord, but none the motor homes we've owned were set up so that could be an option. I found a few on the Northern Tools website, but they are only rated for 120-volts at 30 amps. The problem with retractable cord reels is that the current must pass through slip rings, so they essentially have moving contacts. I didn't find any for 240-volt, 50 amps.
One of this type could be put in a storage compartment and wired to the shore power circuit.
Coxreels Professional-Grade Hand Crank Extension Cord Storage Reel — 30 Amps, Model# 1125PCL-8-C
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