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The install is easy. 'm thinking about putting it in the post "pocket" (whatever they're called) just under the bed rails to protect from the elements.
Put dielectric grease inside socket.
Make sure to use appropriate gauge wire for amps you want and also for length of run.
Fuse the + positive side wire as close to the power source as possible with an inline fuse holder smear dielectric grease on fuse before inserting. ( I like the rubber with water proof cap kind that take blade fuses myself)
Even if you don't live near a place that sells marine supplies you can get a lot of this stuff at auto store or radio shack.
This is how I set up 12v outlets in the back of my boat in a saltwater and always very wet environment (boat stored outside and it rains 200+ days a year here) no problems going on 3 years.
Ive seen all kinds of plugs in the bed. I've seen 12v, 110v, and if youre set up for a 5th wheel, theres a 7-Pin in there. its all possible, just get a weatherproof, "spring loaded door" outlet.
Depends what you need it for. If you have 7-pin trailer plug, the easiest way is to buy a 7 way plug and wire cigarette lighter socket to charging prongs. This way you plug it in when needed and it will automatically go off with engine off. Having 30 amp service gives you some serious power for small items as well. If you need one when you camp, I would just attach fused wire to battery bolt and run it along the frame.