Also many times a manufacture will request a lower HP engine, for their entry to mid entry RV's. Saving the higher HP for their higher end RV's. (Much more so in the DP side of things...). The F53 comes in different weights, as well as different levels of suspension components. Look at some of the entry Class A's on the F53 on shorter wheel bases... Easy to spot with the large 'Tail wagging the dawg.' overhang:)!. Some Entry level coaches with the F52 will not have rear pan hard bars, and or smaller, or even no, sway bars. It's all about marketing, and hitting price points.
Can't say if the lower HP is part of this or not, as I was not even aware that the V10 came in different HP levels within the same engine year:)!
Best,
Smitty