OP, don't go tilting at windmills by looking for things that could but won't likely go wrong during a trip. IMO the bike provides an economical opportunity to hone your mechanical skills, set up your fit, kit out the bike and do a loaded tour. Test rides are useful and fun.. Mechanical stuff happens to everyone on occasion but if you start with a thorough inspection from a credible mech (find him) and fix any issues, you're good to go.