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If you want a mile eater, you want a Goldwing.
You can buy one in any price range you'd like.
The new ones are $30k.
1 Gen old ones (pre 2018) can be had for $8kish.
2 Gen old ones (the 1500) can be had for $2kish.
You're going to say no. That's cool.
Keep in mind that I've done tens of thousands of mile commuting on a GL1800.
I feel like there are some BMWs (like 'bubs mentioned) that would fit the bill as well. I don't know enough about them to help.