Hello Folks - just a little follow up. Based on the recommendations in this thread, I ended up purchasing a Prodigy P3 controller. It was a snap to swap out the Voyager and install the P3. Same wiring connection, same bracket.
We just got home after a 1,350 mile Spring Break trip. What a difference! The new controller was so smooth, easy to adjust and worked exactly how I was hoping it would. Set it and forget it. Wow!
I am really grateful for all of the advice and experience you shared. It made the trip - especially the stop and go traffic we hit, much more enjoyable. Thank you very much!