Good list. I would also pick up a 50amp to 30amp dog bone and a 25' 50amp extension cord comes in handy sometimes too. You will probably need 30' of sewer hose as well as donut or twist on connector to attach to the camps sewer connection. A clear elbow at one end or the other helps you know when your sufficiently flushed. There is lots more you may decide you want, but this will get you started.
PS. The Progressive Industries EMS or surge surpressor is the Gold Standard.
2015 3100RL legacy...2005 Ford F-250 CC SB. Tows like a charm! 4/19 Updated to 2017 Chevy 3500 CC SB SRW -hope it tows as well as my F 250 did!