Leonard,
Here are a couple of threads (one for a 3750 install and the other for the 3850 install) (same configuration) where I provided photos of the process. This is assuming there is a transfer switch installed. I know you remember it because you replied!!
If there is no transfer switch, I think the location would still work provided the shore feed input line can be lengthened to that location, if not you may have to do some investigation beneath the stairs since that area is immediately adjacent to the breaker panel.
If you pull the basement panels, you can see everything that you have to work with in terms of available areas.
3750 install with Automatic Transfer Switch
3850 install with Automatic Transfer Switch
Hope this helps or at least gives you some ideas!
Bingo
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Bingo and Cathy - Our adventures begin in the hills of WV. We are
blessed by our 2014 3850FL Big Sky (previous 2011 3750FL and 2007 3400RL) that we pull with a 2007 Chevy Silverado Classic DRW CC dually.