I have been following this with great interest.
Other RV forums and truck forums seem to indicate 5 Star is best for RVs
especially the V10 Ford. I understand that the owner is also and RVer.
With everything being computer controlled now days and the factory settings being a compromise by necessity, I have been looking for the optimal.
Timing, fuel ratio, torque converter lockup, shift pressure, shift points, even the throttle are all now computer controlled. From what I read the increase in torque, quicker motor response, better shift points and converter lockup are well worth it. It all depends on what you are looking for and where you RV.
I too am looking for honest feedback and not just opinions for self justification of the expense.
Hopefully I will find out for myself soon.