The USPS is a potential gold mine.
It has an infrastructure that would take years and cost billions to replicate.
It doesn't pay taxes. It doesn't even have to license the vehicles it has.
It's problem, among other things, is that it is restricted from adding profitable products to it's offerings, is unionized, cannot fire employees it does not need, and is stuck with an obscene retirement plan.
Remove it's shackles, hire a competent CEO, and watch it fly.