Update: Shuttle bus is getting all new brakes including drums, hardware, cylinders, NAPA premium riveted shoes and new studs/lug nuts and drivers side. Also found a set of used OEM wheels and hope to have it back on the road by weeks end.
I thought I did my due diligence before driving it 600 miles home. Before I left I checked the fluids and topped them off, checked tire pressure and threw a couple of cans of Seafoam in when I filled the tank. I did a visual inspection of the tires but if I would have checked the lug nuts as well this probably never would have happened. In addition the the drivers side problem, when the passenger side wheels were removed the lug nuts on that side took zero effort to remove...I took for granted that the government agency where this came from, that is required to maintain their vehicles for safety reasons, did not have the lug nuts properly torqued...not even close.