If you were unsure, you could use one of those "boxes" that adapt for trailer wiring, or use relays to "buffer" the load. This would draw the extra
current from hot wire added to trunk (you probably have a thick amp power wire ready to do this).
But I expect the 2a or so added by one bulb would be OK for the wire,at least to try. The fuses are sized to protect the wire. I would not increase fuse size, but if you blew a fuse ,no damage done.
Some flashers will blink too fast or too slow in response to the added load (at least older ones do). Light out indicators also get fooled by double lights. Like was suggested, someone must have trailer light experience with the gen 7. But since the the separate turn and brake lights must be converted for Trailer use( brake lights ARE tail lights that blink) I expect adapters are always used. Some adapters buffer and some don't.
Search the web for trailer adapters.....
Are you out to double up on both brake and turn lights?