I too am confused on the "reel" set-ups... are these really used for the 50amp service? In 2008 I drove a show rig around the US and required 50amp service and in one of the expo's my hook-up was about 2' further than my standard shoreline. Not wanting anyone to trip, I plugged in my 25' extension and coiled it under the rig (diameter of the loop was about 3'). This worked for about 45 minutes and I suddenly lost power. I called it in and they reset my breaker, but it only took about 15 minutes for it to trip the second time. After about 2hours of the service staff checking and re-checking current, voltage, etc. the guy next to me mentioned that it was probably due to the coil under my rig- he had that problem once before. They ignored him and hooked me back up. A short time later the same thing happened, so I figured it was worth a try to check the loop and boy was it warm! I called it in again and requested a shorter lead (they had a 6' extension) and I went the next 3 days without a hitch.
To this day I won't coil any of my cords if I'm running anything more than a battery tender.
I'm no expert, but I don't think that coiling the shoreline is capable of stabalizing the power coming in... in my experience, if you want to stabalize, you need a capacitor(s) to act as a buffer against spikes/ or store a little for momentary drops. Thoughts?
IMO training the cords is a must, complimented by your prefered method of storage (clamps, straps, or bins) I prefer to use a combination of those methods (clamping/ straping the cords, then putting them in a bin). Thanks dad for the anal-retentive tendencies