I’m looking to add an outlet outside. The circuit I’d like to tap into currently has a gfci 2 outlets “up” line from where I’d add on. It’s a small circuit without a lot of real load draws. Can/should I make the outside outlet a GFCI? I thought 2 GFCIs in the same circuit trip each other. It would be the end of the line if that makes a difference.
It depends on how you terminate the new wire that is added to the existing receptacle j-box. If you land the wires on the "LOAD" terminals of the existing receptacle then the new wires and receptacle will be protected by the existing receptacle. If you pigtail the wires ahead of the existing receptacle (or doubled up on the "LINE" terminals if provisions exist on the old receptacle) then you will need to use a GFCI outside.
Also be aware the new outdoor receptacle will need to be weather rated, and some circuits that have GFCI requirements aren't allowed to extend out of the room served, kitchens, bathrooms, and some laundry room receptacles come to mind.