Dave,
Mine is quite sealed up, my issue was 2 tee shirts, one pair of shorts and not much else. A sweatshirt would have helped tremendously. I had planned on the southern route but after transiting the southwest at work, the combination of fires and duststorms proved to be more mess than I wanted to deal with, hence the change to the more direct routing.
Even though I was only cruising at 100mph or so, the ability to travel in a straight line, made short work of distances that would have been considerably longer in a car. Cross country travel is quicker in a jet, obviously, but slower on a bike, its all relative. I think 5-600 miles a day is very comfortable, so decide how long you can sit per leg.