[removed content] tariffs crippled the US solar panel manufacturers who had to pay much more for components made in China. But a good deal for the oil companies who don't want competition from solar generation.
Zamp did not manufacturer panels so much as assemble them as is the case with Grape and Renogy. Purchasing agents at places like Winnebago want as few suppliers as possible and with the Dometic acquisition they are being induced to stay with the Zamp product despite their limitations.