cross country upgrades
Ford Econovan



If this is your first long distance ride, then you should probably do a supported ride. Your friend /spouse in the van would carry spare tires, spare parts, a spare bike, medical supplies, and tools. And lunch or dinner as well as water. They can carry your tent and sleeping bags if you want to camp under the stars. 

They'd help ferry you to the next motel if you bonk in the middle of the Arizona desert and give you shelter in a sudden thunderstorm or tornado. They can hit the antique shops or casinos between segments while you're pedaling away. 

I can't think of a better (faster, safer) upgrade for a newbie long distance rider.