Just a thought, if still following this thread. I put the Lewmar Pro-Series stainless on my 2120 matched with 300' of 1/2 rode and 20' of chain.
Although the locker would except more rode, for the windless to function smoothly there needs to be a drop space of about a foot. The 300' of 1/2 inch is about the optimum for the 2120 with windless. With insufficiant 'drop' wet rode bunches at the top of the locker for the last 50 or 60 feet and has a habit of bunching up in the feed port and freezing the windless. Just a minor annoyance, still beats the old hand over over hand retrieval system.
By the way this is my second Lewmar and both came with switch wiring and breaker.