I did my commercial check ride in July of this year with Jeff Allen at Galesburg, IL. I believe you can contact him through Jet Air on the field. He was very fair and I recommend him. I did the check ride in my Cessna 170 so I can't tell you about his willingness in a RV.
Send me a PM for his phone number if you can't reach him.
If you are considering Florida as an option from Illinois then certainly Tennessee would be acceptable. I did my Commercial check ride in my own RV with a certain well-known record breaking aviator in southeast Tennessee. She will want information about the builder, the build, the accident/incidence/maintenance/flight history of the experimental and your familiarity with the aircraft but she WILL consider doing a check ride in experimental aircraft. PM (or Conversations) me and I can share contact info.