Ok I've take a couple long distance trips and here's my $.02
1. Good helmet & ear plugs -believe it or not the wind noise adds to fatigue
2. Good windscreen -helps reduce shoulder fatigue from wind blasts
3. Camelbak Hydration system - Dehydration is a key factor on long rides and increases cramping - this will allow you to drink without stopping
4. throttlemeister or throttle lock -- your wrist are gonna feel the stress after about 500-600 miles
5. Advil -- just in case age starts to catch up with you, starting in the lower back lololol
6. Tire repair kit (the plug type with CO2 cartriges) -- look nobody wants to have to use a plug to repair a tire but you don't want to have to push your busa 10-20 miles to the closest gas station.. And you definitely don't want to have to leave it on the side of the road ---- Better yet get AAA with the motorcycle coverage.
7. Emergency equipment -- toolkit, first aid, cell phone, extra set of keys, extra headlight bulb, rainsuit, plastic bag (to wrap stuff in if it rains) etc.
Items if you are gonna be a regular long distance rider
8. A comfortable seat --- saddle sore isn't something you just get riding horses
9. Heli-bars or some type of bar risers --- reduces the need to lean over the tank
10. 750 pegs --- they will give you anoth 1/2- 3/4 of leg room
11. Good alarm with pager, good chain/lock, and a bike cover --security is always a must you may not always get a ground floor room
Ok that just about covers the necessities I hope it helps