This from Mike Summa:

This is the Wheaton Fire Dept.’s E402.   A 1970’s Seagrave with unknown specs.  I do not know a thing about Wheaton, so feel free to fill in the blanks.  Picture is from a fire muster in Wheaton in the early 90’s.
Mike Summa
classic Seagrave P-Series fire engine

Wheaton FD Engine 402. Mike Summa photo