An estimated 1.73m vehicles were repossessed last year, the most since recession-wracked 2009, according to automotive-service business Cox Automotive. There are signs the surge continues. The catch? Volume is more crucial than ever. Middlemen, known as forwarders, are increasingly hired by lenders to oversee the repossession process, pushing the companies that actually find and recover cars farther down the food chain, shrinking their profit margins.