"The economy has been going well and demand for our services as been strong," he said.
HNA has brought in TIP Trailer Services - its European subsidiary - to help UDC transition to the new owners.
TIP provides transportation and logistics customers with leasing, rental, and maintenance solutions in Europe and Canada.
Bob Fast, TIP's chief executive and president, said TIP had successfully absorbed into HNA after its purchase in 2014.
"We successfully managed the transition to the HNA group," he said. "We are very much a stand alone company, just as UDC will be," he said.
"We are not anticipating a lot of issues (with UDC), apart from the US usual information technology hiccups," Fast said.
Hainan-based HNA, which evolved from a regional airline to a global conglomerate with more than US$90 billion of assets, plans to preserve UDC's existing operations.
On completion of the transaction, UDC will sit under and report to Global TIP Holdings.
Last year, UDC posted a record annual profit, driven by booming car sales and strong growth in forestry, transport and construction, of $58.5m.
The company had been up for sale for more than a year, attracting the interest of NZX-listed Heartland Bank. By December, HNA emerged as a front runner.
HNA is China's largest non-bank leasing company. It operates one of the world's largest aviation finance businesses as well as one of the world's largest container leasing businesses. The company has 410,000 employees across Asia, North America and Europe.
Last year, HNA spent about US$6.5 billion on taking a 25 per cent stake in the international hotels group, Hilton Worldwide Holdings Inc.
The company also owns Seaco - the world's largest container leasing company.