Hey guys, thanks for all the input! I'm taking everything into consideration. I really appreciate it.
Unfortunately I don't have enough time to stretch the travel over two or three days. I did a few more calculations on my trip just to check out my options...
Google Maps suggests a 6.5 hour trip in 470 miles via the interstate route. That means the average speed would be about 72 mph. This might not be too bad, however, my preference is still the other route. Traveling the state highways, Google tells me 450 miles in a little over 8 hours. That averages out to about 56 mph. And I've got 4 stops planned in between. So I'm confident that I can make the non-interstate highway trip in under 10 hours with a fairly comfortable speed. I think 60-65 is good. I can image that too much faster than that would get uncomfortable after a few hours. But 10 hours as a high estimate sounds reasonable. I'll plan to leave before 9 am and be at my destination around 7 pm.
I'm really banking on not having rain. Maybe that's sophomoric. But I'm not going to buy rain gear. My protective jacket has a rain proof lining but I don't have anything else to keep the rain out for myself. My luggage came with rain protective covers that are actually attached and easy to put on. And that's good enough for me. My valuables can go inside the luggage and I can trek on. If I get soaked, I'll just change at my destination. I've ridden in the rain before and can handle it, unless it starts to downpour and storm really hard. If that's the case, I'll probably see it in the forecast and just end up taking my car.
As far as the other suggestions...
I need to look for a way to power my phone. I've got a Pebble (the 7 day battery life smart watch) that can receive Google Maps directions. I can leave it on and turn my phone screen off and my phone will stay alive for plenty of time. Still, I'd be more comfortable knowing I had a way to charge my phone. Is there any kind of DIY guide around here? I'll have to check...
I will for sure be wearing earplugs. Or maybe some noise-cancelling earbuds with quiet music for a stretch or two.
I plan to bring some water with me and buy more and drink plenty at each stop, as well as fuel up often. (I'm in the habit of drinking at least 100 oz of water daily anyways.
My first bike was an XS400 with no screen. I took it on the highways before and did okay. But I would at least like to test and know if a bigger screen would benefit me. The stock one is not much. I almost always sit upright over it anyways, unless I'm trying to buckle down and pass someone at a higher speed.
I hadn't thought to bring lube with me. That's a really good, and obvious, idea. Will do. I've got a tire gauge and flashlight in my Slime kit.
Thanks for the PSI suggestions. I'm 195 lbs and about 6'0, so I imagine similar would be good.
I got new tires about 2,000 miles ago. I don't imagine I'll be riding a ton between now and July, so I'm thinking the tread life should be pretty good still. (Bike currently has about 10,500 miles on it. Over 6,000 of those are mine!)