Given this does not seem to be a commonly reported problem, I am not sure what to make of it. I have had zero charging or related issues with either my past Hallmark or my current NorthStar. Speaking as retire RV tech, normally when I see drops like that under minimal load I expect to find a corroded or loose connection. Measuring amperage is often more helpful is diagnosing this type of problem as if it was a connectivity issue, replacing the entire line would have eliminated any such problem if it existed.
Although I know Lance favors heavier charge lines, the appliances and amp draws are common to a multitude of TCs which do not seem to be reporting similar issues.
Just my thoughts.
Steve and Andra
2012 F350 6.2 gasser SRW LB
Fab Fours front and rear in case we run into a rhino
2019 Northstar Laredo SC