The 7 way is an easy one. They have a for lack of a better term "T" plug for the existing one. You take the existing one apart a couple of tabs and it unplugs the two haves of the connector on the back of the plug, plug in the new T pieces and now you have a I think it is a 7 foot long pigtail to put in the bed or wherever you want. You will have to drill the hole in the side of the bed. When I did mine easy peasy 30 minutes tops to install/add the plug.
Obviously Ram makes one but so do others like Curt