In early 2017, the first test spin in our 2006 Tiffin Phaeton took us to southwestern Kentucky. We considered various campgrounds around Mammoth Cave National Park, settling on Nolin Lake State Park because it had improved plots that accommodated our 40-foot motorhome and towed Chevy Cavalier. We didn’t realize how far it would be from the beaten path. More like we didn’t realize the “skinny” roads leading there would barely qualify as “beaten paths.”  And, thus we learned the most important of our dozen first-timer lessons. Do NOT trust GPS. Before you go, learn about the skinny roads between highways and final destination. Review a map or, better yet, Google Earth for a sense of topography. You don’t want to travel a single lane,…