[zerkten]

Is this a question of redesigning your visits to incorporate your real stakeholders? There are many companies with management and workers at polar opposites like this. I've seen this tackled by proposing that you offer some on-site support sessions and bring support and engineering along for the event.

Focus on making management at the company feel like they are doing something for their deployment and get more forthright feedback because they can't be in as much control. Establish some direct follow ups, if needed, to primarily tackle the support issues, but ensure the folks who were on-site are part of that conversation. Present a summary of the event back, including action items which you take from the event alongside their pet problems/requests.