If you take the drive down the Iron Mountain Road, from Keystone to Custer State Park you'll pass through three tunnels. They are perfectkly aligned so that you can see Mount Rushmore through them. However, they tunnels are short so don't take the RV through them. We either enter Custer State Park via Hermosa on the east or from the west (Custer, SD).
Mark & Leann Quasius
2016 Cornerstone 45A
2007 Allegro Bus 42QRP (Sold)
2012 Jeep Wrangler Unlimited - Rubicon