(Bloomberg) -- It has proved impossible to call the peak in this euphoric US stock market, says Goldman Sachs Group Inc.’s tactical specialist Scott Rubner.Most Read from BloombergApple to Wind Down Electric Car Effort After Decadelong OdysseyHow Much Wealth You Need to Join the Richest 1% Around the WorldTrump Eyes $4 Billion Stock Windfall as His Legal Bills Pile UpFlawed Valuations Threaten $1.7 Trillion Private Credit BoomOffice Tower Deal for $1 Reveals Anxiety Among Longtime BuyersRetail t