OnesJMU,
Not an easy answer!
Do you want continuous power? That way the Dash cam can record while you are not around your truck. On the other hand.....
Be careful about leaving your radar detector on. The third winter I had my 2013 I went to Florida with a friend leaving my truck at my brothers for two weeks. I returned to find myself locked out with the battery dead in 20 degree weather and 6" of snow and ice built up on my truck....the culprit...I had left my Valentine 1 on...
Look in your owners manual for circuits that are not affected by the ignition ...computer, ignition hot wire, radio memory, etc. Or pop your fuse box lid and test the circuits with the ignition off....
If you only want them powered when the ignition is off the options will be much more as the majority of electrical circuits are cut off when the ignition key is off. Again pop the fuse box and look for circuits that are off with the ignition in the off position...
Google is your friend; as is the RED search tab at the top of the page...
Good luck,
Eddie
ps There's plenty of unused space in your fuse box...