it looks like a fine bike for the trip. I'd suggest replacing the front crankset with a 110mm five arm double 34/48 chainrings . If you can get some 1 1/4 tires in there it would be nice. Those pedals are worth replacing. Have the shop go over the rear wheel, it looks like it hasn't been ridden much but it's worth checking. Get in some miles on the bike with your intended load just to see how the whole setup stays together.