I'm planning to get the tires balance before the trip, but I simply have not any time to do much more than work since early Feb. Nothing in the drivetrain has changed since it ran smoothly so it's possible the steering arms are not tight enough or a tire weight came off.
I did an inspection last night and I noticed that the rear mount on the lower radiator hose wasn't mounted up so I corrected that, but I'm sure that was another issue.