...can the battery handle a second liner for my wife?
Check the battery. I just had a dead in the driveway incident on my '07.
I didn't realize the bike had the original OEM battery...
2 liners, heated grips, GPS, radar, aux lights, no problemo.
If you add a bunch of electrical farkles, install a Fuzebox or Centech fuse box.
PLenty of room under the seat.