As you ride from west to east--be mindful of your fuel stops, and plan them ahead, carefully.
A VN750 in good condition, driven properly, can go maybe 175 miles (+/-) b4 you are walking. Depending on the route(s) you take, some fuel stops out west can easily be well past 150 miles apart. Don't let lack of planning with this spoil your trip--or worse.
One of the other participants on the forum carried a 2-gallon fuel container, on the rear rack, for just such possibilities...while she and her husband were out west.
Also: your bike may or may not be afflicted by this....but do a forum search here for the "phantom gas syndrome".....and know what to do if (or when) it happens.
If you don't already have one, pack a good tire repair kit (for tubeless tires)--and know how to use it, b4 you leave.
At this time of year, especially out west, your biggest "enemy" on this trip will be probably be dehydration. Know the symptoms of this...and/or when you stop for gas....get something cold to drink (and/or go with a "camel pak" or similar type dispenser you can drink from as you ride). Drink cold water or Gatorade-type products. Avoid anything with caffeine in it--this will only make things worse.
Otherwise, KM above is right. Other threads already exist on what you should take with you on a trip. Look them up here, using the same "search" feature above in the menus.
Take a good digital camera--and lots of pix during your trip...be sure to later share them with us!....