Is there a good app for long distance secondary roads?

Gtetrailer:

Is most of your travel east of the rockies? Roads are more scarce out west.

I am only seeking the level of detail that google maps has for freeways -- just without erasing the smaller roads.

The problem is that software seems to be in 2 main groups:

Topographical map software, which has too MUCH detail for longer routes,

...and drive-time software which shows blank areas where roads are.