I made the trip from SSR 2019 to Port Angeles, WA last year. There is a lot of...something less than exhilarating...geography to cross between corners.
How much time do you have to spend? My first thought was to review the Members Map and see what route takes you near other members, may take a bit of the drudgery out of a couple days. Depending on what you're riding, your tolerance for speed risk and saddle sores, I'd say you might make better time on the secondary roads rather than interstate. I came up from Chattanooga to Little Rock to Shawnee OK, Liberal KS, Denver/Cheyenne/Yellowstone/Boseman MT. The only sufferage was western OK and Kansas in September, but though it wasn't exciting it was new and went pretty fast. Gas stops pushed the 1100 Sport's tank capacity to the limit.
It's a trip I wouldn't trade for anything, and I'll do again some day when I can spend a bit more time in the places I wished I could have.
<edit> oops ya 2018. Time flies.