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Drillium Dude
Back issues can be dealt with by raising your handlebars - ie, you don't tour on the slammed stem Itie bikes you typically ride. Lower gearing and higher RPM's help as well. Stopping frequently gets you out of a riding position - it's a tour, not a race.
The body-to-saddle interface can be dealt with in various ways. My go to method is this:
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If someone tells you that you have enough bicycles and you don't need any more, stop talking to them. You don't need that kind of negativity in your life.