Here's a new interactive chart from NPR that gives a look at most common occupations by income bracket across the United States (2012). Click and enjoy exploring. Notice that you can click on any box in the chart, and the same occupation will be highlighted yellow in each category.
Truck drivers are one of the more interesting occupations featured in the chart. They are one of the top ten most popular occupations in 9 out of 12 groups on the chart. In fact, they are the tenth most popular job in the $72k-$103k (80th-90th percentile) income category, but are also the tenth most popular job in the $12k-$21k (10th-20th percentile) category. In the $26k-$48k range, truck drivers were the second most popular. This speaks to the wide variety of duties and demands faced by truck drivers.
While we don't (yet) have such a fancy chart for Oregon's occupations by income bracket, you can find out about Oregon's occupations in demand here: Occupations in Demand (2014).