From the Amp website:
'October 4, 2013 – Lund International Holding Company, a portfolio company of Highlander Partners, L.P., today announced it has acquired all of the operating assets of AMP Research. AMP, based in Tustin, California, is the leading provider of automatic power articulating running boards, bed steps, bed extenders and related products. Lund will continue to use the trademarked POWERSTEP™, BEDSTEP®, BEDSTEP2™ and BEDXTENDER HD™ product names included in AMP’s Innovation in Motion product lines. The current Tustin location will continue to be the primary manufacturing facility and AMP’s current workforce will join the Lund International team.'
Looks like Horst no longer has any involvement. Sad times.