Guessing here, but it appears the routing engine for the phone app is different than the web-based RVTW program. That may explain this difference, although both take into account your RV size and weight.
As for explaining why one route or another, I'm not aware of any that explains why, unless they are specific pre-defined hazzards that are normally displayed. So much of these RV programs is " borrowed" from what the trucking industry instituted to assure commercial shipment transit from point A to B safely and to assure their payday, that much of the specific programing is invisible to the user. Just a fact of life.
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Mike and Cindy
2016 Tiffin Allegro Open Road 34PA
2018 Chevy Malibu
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