I did 5600 miles round trip - Panama City, FL to/from Billing, MT back in July on my 2011.
Here's the setup I used:
120 liter Overboard Waterproof Roll-Top Duffel contains mostly camping equipment. Nemo Morpho 1p tent, Big Agnes sleeping bag/Big Agnes insulated air core pad, Hammock included as alternate choice from the tent. TravelChair and a few other odds and ends. 60% full.
(At 120 liters, it's larger than I really need but it's also truly waterproof - so I've opted for it over my North Face medium duffel that I found wasn't as waterproof as I'd hoped on my shakedown run to Key West a couple of weeks ago.)
Right Pannier: Tools/Compressor/Plug-It kit/Chain Lube and Jack/Rain Suit/Rain Boots/Cycle Cover/Cheap Walmart Tarp/ (100% full)
Left Pannier: JetBoil stove/Spare Fuel/Food/Coffee/Toiletries/Rags/5-Hour Energy stash/Bottled Water... and a few other odds and ends. 80% full
Top Box: Clothes/Spare Visor/First Aid Kit/Huggies Butt Wipes/Camp Towel/a few other odds and ends. 100% full.
Tank Bag: Camera/Phone/Leatherman/Camera Monopod/Visor Cleaning Kit/a couple of 5-Hour Energies/Trail Mix/Tire Gage/Pen/Notebook/Small Binoculars/odds and ends.
Your tires should be fine - with only 700+ to start out with.
I swapped my 5000 mile tires out before my trip with two new PR
-3s... I had a flat (nail) in Oklahoma - about 950 miles from home. I plugged the hole with my PlugIt kit and got home just fine. Once home I replaced the rear tire with a new PR
-3. So now, the front PR
-3 has about 6000 miles on it and the rear has about 2000 miles on it. Both still look new.
So... I'd suggest a good toolkit, a compressor and a way to replair punctures... or reliable roadside assistance.