That looks fantastic to get the pit that empty, but did the sand stay in suspension in the tankers, or do you have a lot in all of the tanks now.  Drag hose guys don't want the sand in the hose, and tanker operators don't want the sand in the tanks, so it gets to be a balancing act.  It sure is simpler when it all leaves as liquid.  The Nuhn design, being self propelled sure looks great.   Thanks for sharing