Assuming it is 8 pounds worth of basic tools, food&hydration, and some clothing (regular 60 mile ride), it is not a substantial weight that would require specific carrying gear or a bike design.

I think you are more likely to suffer from the fact of taking a brand new bike (that you've barely ridden before) on such a quest. If I were going for long, endurance and reliability, I'd take a bike I have ridden for a while already, a bike I know its qualities and its shortcomings. Basically I would eliminate unknown variables so there are fewer things to worry about and more free mind to try and enjoy the trip.

If you either do not have a bike you deem suitable for the task, or are aching to get a brand new bike for the next adventure, I'd strongly suggest to get as many miles on the new bike as possible before the actual event, get your butt comfortably acquainted with the saddle and make fit adjustments as required.

Good luck