"Tech manufacturing is already starting to move away from China so it's a double win for Trump...though can't see it moving on shore...more likely to SE Asia and then Africa.""
An unintended consequence of Trumps Trade War might be to accelerate the growth of other 3rd world nations trade and technology. China is already off-shoring, out sourcing and investing in other countries because wages in China are rising. If The US puts punitive tariffs onto imports from China, the most obvious way for China to side-step the tariffs is to build and export from other countries.
It could well end up being painful for the US, at least initially, but might actually be better for the world as a whole with a bit of wealth being spread more widely. (well, I can dream, can't I?)