I use a laptop in my Jeep connected to a handheld GPS using DeLorme Topo USA 6.0 to map and track our 4x4 trips. I also have DeLorme Topo USA 8.0, but of the two software versions, back country roads are much better on the 6.0 load.
I didn't notice it until a recent trip where I was using a different lap top to map the trails that was loaded with the 8.0. Honestly, nearly 80% of the desert roads showing up in 6.0 magically disappeared in the 8.0 load.
I have written DeLorme asking why I would want to upgrade to their latest Topo version since the data is much better in the old load... I bet I never hear back from them.