Pack light, Amir. Start by laying out everything you think you'll want, then find a way to leave half of it behind. Less is more on a long trip. There are 2,000 WalMarts in the USA...for better or worse, you're never that far from one.
Compression bags let you mush stuff down to size. Great for reducing "fluffy" stuff like a sleeping bag, fleece jackets, etc. Akona makes a great waterproof compression bag so you could keep your stuff dry if a frog strangler soaks your bags.
If you need camping gear, shop for backpacker's equipment which is usually light and packs small.
The V has good range and a big tank for a 650. I'd pass on carrying spare gas.
A good road atlas would be on my list. I've found my zumo GPS is a great navigator, but on its own it's a lousy route planner. A Michelin atlas is spendy but a good investment. Find one that fits in your tank bag or can lay flat on a top case so you can access it easily.
If you have a GPS and can download extra POIs to the memory or a card, get a list of all the Kawasaki dealers. Look on www.zumoforums.com...it
may be there along with some other cool POIs, like national parks, KOAs, etc.
In addition to a tire repair kit, I'd get a small power compressor. Those little C02 tanks only do so much. I have a Sparrow AirMan, which I like, but there are others. I've seen some ST guys take one from AutoZone remove the plastic housing to reduce the size. A compressor could serve double duty to inflate an air mattress if you carry one.
Carry tools needed to remove the wheels and know how to do it. You might consider getting an AMA membership. For $39 you get roadside assistance. https://home.ama-cycle.org/amajoin/0...?tmpnum=IJAP05
Use it once and it's paid for many times over. Don't use it and you still support the AMA.
for your backsides. A stock seat will probably be torture fairly soon. I have sheepskins which help quite a bit. Rather than sink $500 into an aftermarket seat, you can get your stock seat modified. Try Spencer (http://greatdaytoride.com/Home_Page.php
) who does great work. He did seats on my ST1300 ($90) and my V ($75). Does great work, one of the nicest guys you'll ever meet or do business with.
Good underwear, like Under Armour or ExOfficio Give-N-Go, will keep you comfy. Wear a pair, pack a pair. The polyester microfiber shorts dry in a few hours.
Good socks. Sidi Coolmax socks are the best for riding I've ever used. http://www.newenough.com/boots/boot_...oot_socks.html
Again, wear a pair, pack a pair.
If your GF wants to ride cross country two up on a 650, you better think hard about making her your lifetime #1...women like that are hard to find.
A few squares of microfiber cloth and a spray bottle of Novus or Brillianzie or similar plastic cleaner to keep your face shields clean. I look over the windshield and don't worry as much about keeping that clean, but I like my face shield clean.
As far as your route goes, I'd stay off the interstates as much as possible. They all begin to look the same really soon, whereas the nation's byways and secondary roads have lots of distinctive characteristics. Take your time and enjoy the ride.
Carry chain lube and use it.
Have a safe trip and a great time.