C6 Launch contracted Highland Enterprises of Las Cruces to build a vertical test stand for static-engine integration testing (SEIT)at Spaceport America. The flexible design of the stand supports several different engine sizes.
https://www.spaceportamerica.com/c6-launch-systems-unveils-rocket-test-stand-at-spaceport-america/
https://ladailypost.com/c6-launch-systems-begins-rocket-testing-at-spaceport-america/
https://www.c6launch.com/c6-launch-unveils-rocket-engine-test-stand-at-spaceport-america/