Explain it to me (sans facts).

I absolutely would. Make it clear that you aren't just arbitrarily raising prices, that there is a cause, and exactly what that cause is so that people are pissed about it but at the right people.

I'm seeing more companies making it a "tariff surcharge" right before the tax line item.

When there tariffs change every time Trump goes into Twitter, i would expect them line itemized and with a timestamp.

It makes sense. It is clearly to show to dumbfucks who voted for this how their dumbfuck decisions cost them.