The "P" annoys the crap out of me... I interpret it as "public non-forest roads". But it obscures the actual road number. Consider "P" to be paved boring stuff. :-)
I saved the MVUM's per page as low color, high resolution PNG files. Then I added it in Google Earth as an image overlay, distorted it around until it lined up with Google Earth's lines. Kind of a PITA... But has been very useful for the maps I've done so far. Unfortunately, having all of them enabled really pisses off Google Earth. It's a shame I don't have some real GIS type software, or at least Google Earth Pro.
I need to update this, as I've found a few more trails. Woo.