A horse is a horse, of course, of courseDepends on the horse of course.
Seriously, though, no. With one average sized horse, yeah.
A small trailer (Calico 2 horse trailer with electric brakes) weighs in right about 2,500 - 2,600 pounds. An average 'light' horse weighs 1,000 pounds. So you're talking at LEAST 4,600 pounds here for two horses, more likely closer to 5,500 because the horses probably weigh more like 1,500 pounds each.
Your average 1/2 ton pickup (Ford F-150) could pull it - they're on a frame and are designed to pull 8,000 - 12,000 pounds. The unibody construction of these cars just isn't.