I know I can get apps for my phones that will give me trailer-friendly directions, but does anyone know if there's anything I can do with my onboard navigation that would give me the same information? I'd rather use that nice big panel for navigation rather than my tiny phone.

What I mean by trailer-friendly is that the lanes are nice and wide, the road grades are maybe a bit lower, and there's no tight u-turns. My trailer is basically a three-horse slant load with a large dressing room, so not huge but not small either.