Bring chain lube and a credit card.
My longer rides are in the 5,000 mile range. 46,000 total miles so far. The only thing I have needed on a long ride beyond chain lube was a new fuel pump (clogged fuel filter). That's where the credit card would have been needed but since I was only 40 miles from home at the time (returning from a photo tag in Kentucky) my wife was able to rescue me with the pickup.
"Veni, Vidi, Velcro"-- I came, I saw, I stuck around.