It's up to you if you pin it or not, but yes, you have to get in the bed to latch it.
Edit: If you don't already know this, a scamp
fifth wheel...well, isn't a fifth wheel. It's also not a gooseneck. It uses a bumper pull style hitch at a fifth wheel height.
Basically, it's the same as hooking up your current trailer, but in the bed.