You should not even think about going on a road trip without a medical kit. Pack some prescribed medicines for emergencies along with band-aids and bandages.
Good-quality riding gear is extremely important to carry on a motorcycle trip.
Just because you will ride your bike for most time, do not skip on carrying a pair of sturdy boots.
Proper clothes such as raincoats, biking suits, and a few pairs of comfy clothes are required.
Do not forget to pack and carry all the necessary documents. Pack all these in a small zipper file folder.