Schneider National has announced plans to swap out roughly one-third of its fleet by the end of 2012. The trucking company is investing in 3,000 new 2012 and 2013 tractors, chiefly from Freightliner. Schneider said it’s replacing trucks at a rate of 75 per week. With this refresh, the company is adding in a series of upgrades to the fleet. The most touted is a new safety upgrade with the OnGuard collision mitigation system that assists drivers with noticing and avoidi...