He said the towing wasn't too difficult - he was more concerned about the home-made truck, made largely from cardboard, lasting the distance. "It wasn't too bad - I didn't think it was going to hold together until the finish line''.
They were among almost 35,000 people taking part in today's 42nd Ports of Auckland Round the Bays, including 1180 teams. The largest, from ASB, fielded 847 entrants. Participants ran from Vector Arena on Auckland's waterfront, along Tamaki Drive to St Heliers.
Money raised from the Round the Bays supports seven charities: Radio Lollipop, Cystic Fibrosis Association Auckland branch, Crohns and Collitis New Zealand (CCNZ), Kidsline, The Hearing House, Raukatauri Music Therapy Centre and Fairfax First Books.
"It's a fun run, so I do it for fun,'' he said. "The kids laugh and smile.''
Mr Warn, 40, has completed the Round the Bays about 11 times, always in costume and twice as a gorilla.
Manu Halagigie crossed the line in about 45 minutes, helped along by his son, 7, daughter 9, and two nephews, aged 4, and 5.
Mr Halagigie, who was part of the several-hundred strong Mainfreight team, said the youngsters had no trouble keeping up a swift pace. "I was trying to keep up with them.''
Image 1 of 7: Competitors make their way along Tamaki Drive, during the Round The Bays fun run. Photo / New Zealand Herald / Brett Phibbs
The race was won by Jono Jackson for the third consecutive year, in a time of 25m 56s.
Mr Jackson, 23, said it was his fastest finish yet. "I broke free quite early on so I probably had about 6km by myself,'' he said.
"I died in the last bit because I had no one to pace me.''
The first woman over the finish line was Lisa Robertson, in a time of 28m 38s.
Both won a $1000 prize pack from Brooks Running.
A spokeswoman from Fairfax Media, one of the sponsors of the event, said there were no issues with unregistered runners taking part.
"From launch we had clear messaging in the market encouraging people to register to run this year's Round the Bays event and while a few people may have joined in along the course, we are very happy with the result.''
There were no serious medical issues, she said. "Minor complaints included blisters and exhaustion which were handled quickly and safely by the medical staff on hand.''