Just to add my 2 cents. I just replaced my pigtail with the Marinco Stainless Steel Female outlet from Vintage Trailer Supply. I found it cheaper elsewhere, but Vintage has been good to work with.
I thought about the shorter pigtail solution, but had two reservations that pushed me over to the outside outlet. Firstly, not that I plan to drive off with my cord still attached to the shore power I thought this solution would cause the least amount of internal damage. Secondly, the Marinco outlets are water proof. The pigtail would most likely have an outside connection that could be prone to weather issues.
I don't think either of those issues are really important, so I will only rest on the fact that the Marinco Stainless outlet looks really cool! Definitely nautical.
1986 Sovereign 25' CB
2007 Chevy Silverado 1500
2007 Toyota Land Cruiser