A local trucking company paid a tribute to O'Sullivan on the company's Facebook page.
"Words cannot describe the loss we all feel. It is with great sadness we come to grips with the loss of one of our own," it said.
"Stretch (David O'Sullivan) was an incredible operator with an attention to detail that could rival the cleanliest person out there.
"Washing and polishing skills that could bring magpies from districts away, loyal friend and all round top bloke. He has left an everlasting impression on those who worked with him, knew him or had the pleasure of meeting him.
"We take this time to reflect on the laughter, happiness, knowledge, sweet treats, the hard times and the good times we have shared with him as a team and as individuals. We take solace in knowing Kirsty will be with him and how happy he will be to be reunited again.
"Our thoughts go out to his family, friends and our colleagues during this difficult time.
"Fly high Stretch. Your shift is over and we thank you for everything. We love and will remember you now and always. Kia Kaha."
Police said initial indications were that Sullivan may have been unloading equipment from another truck when the collision occurred.
The incident happened about 6pm on a stretch of the highway from the intersections of Glencoe Station Rd and Creek Rd, between Tikokino and Maraekakaho.
The stretch of highway was closed to traffic through Friday night and on Saturday for both clearing of the scene and the police crash investigation, but detours were available.
It was not until 3.45pm on Saturday that police reported the road had been reopened.
According to Ministry of Transport online statistics, the nationwide road toll for 2021 was 148 at midnight on Thursday. It compared with 173 in 2019 and 125 to midnight June 10 last year.
In the police Hawke's Bay area (Napier, Hastings and Central Hawke's Bay) there had been seven fatalities in the January 1-June 10 portion of 2019, and eight in the same time span last year, while Friday night's tragedy was thought to be the seventh fatality on Hawke's Bay roads this year.
An investigation into the crash is ongoing and police would like to speak to anyone who may be able to assist.