I used to plan my trips on DeLorme Topo 4.0. Now they are on version 10 or 12 or something.
DeLorme sold a USB plug in antenna, so I could use my 15" laptop to act as the GPS. This was great when the Garmins where well over $300 back in the day.
Now I use a Garmin to drive back and forth to work, as it has traffic on it, and works pretty good at predicting how much traffic I will run into on the way home. I have found several 'shortcuts' where I drive through the country south of town, then arrive home a lot sooner than taking the freeway.
Topo 4.0 I could plan a route, then click on something to give me a profile of the route. It should show the steepest grade, and give a profile where the mountain pass was like a graph, showing the elevations as it moved from start to finish.
Good luck,
Fred.