There is no advantage to ordering 35 RCV axles. They are only 35 spline for the last 5" of the shaft. It is just as strong as a standard 30 spline shaft.
We offer the ProRock 44 in 2 different center section configurations. One for the Rubi locker and one for a conventional differntial (Detroit, ARB, etc)
Many customers are considering the same thing with their PR44 housings. The standard Rubi locker is very expensive to replace, much more than an ARB, and replacement parts aren't available. Many customers are ordering their PR44 for a conventional differential and installing something other than the factory Rubi locker.