Follow-Up:
Our check engine light came on twice. After hearing. for the second time, that I did not replace the gas cap properly, I took it to the local VW dealer and he checked the gas filler tube. The conversion forces Winnebeago to extend the tube to reach the gas tank. The coupler was allowing vacumn leakage and causing the check engine light to come on. It has been over a year and I have not had the problem again.$60.00 fix.