Tesla shares are surging in premarket trading following reports of US and China agreeing to roll back tariffs on each other's goods for 90 days.Premarket prices indicate that Tesla (TSLA) may reach a $1 trillion valuation again, a level not seen since late February.Both the S&P 500 and Dow Jones Industrial Average were also up in premarket trading, with Tesla stock up about 8.2%.The US and China have agreed to lower reciprocal tariffs on each other by 115% for 90 days, with both sides aiming for more balanced trade.