Mr Keith's wife, family and colleagues had been offered support.
"It was supposed to be a day of celebration and it's quite unpleasant when one of your guys gets injured," Mr Waterreus said.
Mr Keith's wife, Carolyn, said: "He's doing okay. He'll be fine eventually."
Te Puke deputy chief fire officer Dale Lindsay said the incident put a "rather large damper" on the weekend's celebrations.
Mr Lindsay said the road was reopened sooner than expected after the parade and a car "appeared to whizz through" the roundabout forcing the front fire truck to stop suddenly but the second fire truck did not stop in time.