I am flying EWR-PIT-PHL-MUC-ARN on Sunday afternoon. Will I have problems? Some of my connections are not very long but atleast its ok according to minimum connecting time.

I do beleive that the US flight out of PHL to MUC is the last europeanbound flight.

What if I miss a connection and need to spend the night at the airport? Will US get me a hotel? I am both UA Star Gold and LH Star Gold if that helps.