Sandage loaded a car on a transport trailer. The car door could not be fully opened because of a support bar on the trailer. He suffered a back injury when he squeezed out of the car. The trailer had been modified to add several feet to its length, and support poles, including the one in question, had been added. Sandage sued the company that modified the trailer. Sandage sued in strict liability and negligence. Decide the case. Explain.