Older GPSr's like the Dakota and eTrex 20/30 can't show the highlighted roads and footpaths (the borders or dashed lines become red) of Active Routing maps. Some Topo Pro maps contain a separate transparent polyline that contains the (hidden) Traillabels. I really don't understand why Garmin has chosen to hide Trailnames but this can be solved easily by changing the TYP file.
This transparent polyline can also be made visible by assigning a de-centered (transparent in the middle so roads can still be seen) red line (exactly like it's done in Topo France Pro), this red line will make all Named Trails visible in older units and also in Mapsource. You can also use this TYP in modern units but then you'll have both highlighted roads + a red line next to it. If you only want the red line you can change Activity to one that doesn't use Active Routing.
For examples and typ files take a look here:
Topo Nederland Pro: [Only registered and activated users can see links. ]
Topo Belux Pro: [Only registered and activated users can see links. ]
Nüvi 2595 / 60CSx / 62s / Oregon 600