Doesn't leave much room for passenger and luggage, does it? Most of the luggage racks say don't put more than 10lbs on them, but that is commonly exceeded. Buy gear that is multipurpose, and that you can wash out in the sink and dry overnight. Poly products work well...cotton products suck. Teach the BSR that she does not need a differnt t-shirt for each night and day, and a different pair of jeans every day. Riding jeans, night jeans, a pair of comfortable shoes (like Merrels) for night. Stinky t-shirts to ride in don't matter. One saddlebag for her chit, one for yours (your's is also going to contain the tool kit), then the TP is for stuff you need to get to on the trip, though usually some of the BSR's stuff gets in there somehow. Luggage rack is for light gear like rainsuits, fleece jackets, etc.
Or...get a trailer....