Our fleet's rule of thumb from living it: truck #2 loses money for 3-6 months, breaks even for 6 more, and only makes sense if YOU stop driving reactively and start managing proactively. The trap is thinking of it as 'my truck × 2'. It's actually a new job title you didn't apply for. The owners who make it treat driver retention as job #1 from the first hire — #2 truck economics die on driver turnover, not on freight.