Pros
PACCAR is well known and very stable. I worked for their parts division and had no fear of layoffs. Their trucks are the best in the industry and senior management is very focused on the company vision. On the research and development side I was very impressed with the factory and testing facilities. If you are into technology their technology division seems pretty cutting edge. I was also impressed with the way their distribution centers used data to streamline operations. If you can drive a forklift I would say look for employment there. They are a large company so it is easy to find a niche that you are good at. I found their HR department extremely friendly and competent. I found their benefits so-so but they do provide some tuition reimbursement. There was support for training classes, especially if you wanted to learn more about the business. They were also supportive of a Toastmaster's group.
Cons
I found the company to be very hierarchical, especially the corporate office and to an extent the Parts division. Senior management seemed aloof and disdainful of the rank and file. The chairman seems to like to rule by fear; and this attitude seems to have trickled down to other senior management. At the Parts Division, middle management seems more interested in protecting their fiefdoms rather than collaborating with other departments. I have heard another department referred to as "the enemy". I also found middle management likely to play favorites. Time off was a mixed card. They seemed pretty flexible but we were also told that they "owned our weekends" but most of the time let you have them. There were a few good managers though. The corporate and parts division seemed to shy away from capital improvements. They would rather throw people at the problem. The technology they used was pretty old; a lot of their core data was stored on old mainframes. Leads would have to develop spreadsheets or Access databases to work with the system. The Corporate office was VERY strict on dress code. Suits had to be worn at all times, including trips to the Bathroom, and only blue or white shirts were allowed. A friend was disciplined for wearing a red shirt under his suit. Vacation accrued more slowly than in other companies I have worked for.