He also spoke to Anderson on the phone the day the two men headed out on the boat.
"I think I was the last person that actually would have talked to Wayne or Jared," he said.
Wenzlick said Anderson was his best friend, and "like a brother". He had known him for 14 years and despite living in different areas, would talk to Anderson for an hour on the phone every day.
Today, he was "still trying to get over the shock" of what happened.
The Cambridge farmer said Anderson had "always done out-there things".
"You could picture it happening. He'd just be going 'let's go for a cruise in the boat and see how it works'.
"Jared's a keen guy. He's always pushing the limits. I reckon he pushed it that one bit too far."
Wenzlick reminisced on "late-night missions" when he and Anderson would leave Cambridge after 6pm milking, drive to New Plymouth, and get back to Cambridge five minutes before morning milking.
He said there was "never a dull moment with Jared".
"Every person he met and was close to had a different connection with him."
His favourite memory was a day of cruising around in circles on the tractor sharing "three boxes of piss".
"He was like a brother to me and I've got a lot of friends, but he was my best mate."