I can't comment on Uber or Lyft availability in Davenport, but I do know that parking a big camper at the venue would be an issue. The hotel is basically in the downtown area, with a parking garage across the street, and a small lot behind it. As far as Railroad Seminar topics, how about train robberies? I didn't realize that blowing up the safe (and car) in the Butch and Sundance movie was a real thing, until I saw the safe in a museum in Wyoming.
B.N. Scotty