I have a 5015 on my 2009 f250 v10 with a custom tune for 89 octane. I run 89 octane in all my vehicles. I just bought a 2005 e450 Class C motorhome with v10. What is the difference in a 5015 (ford) and your 5015-rv tuner?
This device comes with 5-Star's custom tuning, but as far as the device itself, it's just a standard SCT 5015 Livewire TS+, and is likely the same (or at least similar, if you have an older 5015) to the unit you already have.