I purchased the Magellan RV9165T-LM back in May when we purchased our Class A thinking it would be better for navigating our MH because it took into account things like size and weight and had all of the destinations. After a few trips with it, I have found that it does OK but has lead me on some questionable side roads but its biggest issue (unrelated to this topic) is that it just won't stay on during an extended trip.
I found that the TomTom app on my iPhone has been far more solid in getting me where I want to go and has most of the options I am looking for anyway. I ran it along with the Magellan on every trip to compare it, since it was a known and trusted unit. I am now looking at using my iPad Mini with TomTom as a GPS Nav system once I can find a mount for it.
John & Kerri
2016 Thor Hurricane 35C with our pups MacDuff, Piper and Annabelle