I think the hp30 will last for a while. Although the type of wheeling and how hard i decide to push the skinny pedal can drastically reduce the 30's life span.
I have also considered that the extra weight on the cummins may also contribute to a shorter life span.
The way i look at it is, if and when it starts becoming unreliable i will upgrade to something stronger.
"We have enough youth, how about a fountain of smart"
"Look no further than yourself, for all of the good and all of the evil that exist in this world, resides in the heart of man and his propensity to use it".