DOT5 silicone brake fluid should not be mixed with DOT3, DOT4 or (interestingly) DOT5.1 fluid. If you switch from DOT5 to a glycol fluid like DOT3, you should thoroughly flush the brake system. Given that it sounds like it won't be long before you have to go completely through the brakes on your truck, I suppose it doesn't make much difference at this point.
I'm guessing the USPS went with DOT5 either to reduce maintenance (it doesn't absorb water) or because they thought it would perform better in the stop-start postal service driving.
I inadvertently put DOT4 fluid in the front brakes of my wife's Harley Sportster. (Harley uses DOT5 because it won't damage paint.) When I realized my mistake I flushed it out with DOT5. It was probably a coincidence that the master cylinder failed a year later.
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Today's Featured Article - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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