After years of talk, teaser videos and repeated delays, Tesla’s Semi is finally beginning to hit the road. For electric-vehicle enthusiasts and clean-transportation advocates, this milestone represents a long-awaited shift in the trucking industry. But while the truck’s debut feels like a breakthrough on paper, the timing could hardly be more challenging. With economic uncertainty, fluctuating fuel prices, infrastructure shortcomings and tightening fleet budgets, Tesla faces significant headwinds just as the Semi enters commercial reality.B...