Do you know what your living arrangements are going to be? If you know where you're going to be staying, you might try calling ahead to see if there's parking near a 120V outlet.
I just got back from a month at Fort Knox--similar situation--and took my Tesla without a real plan. I was able to find 4 spots that were within reach of a 120V plug near the barracks, and since I wasn't doing more than 20-30 miles a day it worked out fine. However, the first couple of days before I found those spots were a little stressful, and it could have been a real disaster.
Of course, if your daily mileage is going to be a lot more than that, the 120V won't cut it. Another option is to look into local RV camps, which often aren't listed on Plugshare.