Hi Gary,
The fuel tank did not need to be dropped on my coach. This coach uses a single 208 gallon plastic fuel tank. As can be seen in Dales' photo, his fuel tank in metal. There is a differrence.
The biggest issue installing the new check valves is that the instruction sheet provided by Prevost does not provide enough details to complete the job. I spoke with Mike Frizzel, Prevost Service Nashville, three times while I was completing the job. Without his help I would not have gotten this done.
Also, I found the Convertor installed equipment, inverters, bay carpeting, and Entertainment Center to increase the work required by about twice. Two small and necessary parts were missing from the kit when I received it. I could go on and on. If anyone is really going to do this, feel free to call me and Mike Frizzell. There are a few little tricks that will make the install go smoother.