But the officials underestimated the hands-on enthusiasm of the most important member of their delegation.
"I saw Mr Xi looking at the John Deere tractor," Mr Kimberly says, "and I asked him if he wanted to climb on.
"Of course he did. We were speaking through a translator, but he even didn't wait for the translation, he understood me right away and went right to the tractor."
IMAGE SOURCE, GETTY IMAGES
Image caption, Xi Jinping (centre) climbs out of the cab of the tractor with Rick Kimberley (r) while touring his family farm in 2012
The health and safety fears turned out to be unfounded, and Mr Xi was both delighted and uninjured by his ride on farm equipment.
It proved to be another chapter in the Chinese president's curious ties to the largely rural Midwestern state.
IMAGE SOURCE, GETTY IMAGES
Image caption, The future leader of China seemed to enjoy his hands-on visit
Mr Xi first travelled to Iowa in 1985 as part of an agricultural delegation from China's Hebei province.
He stayed in Muscatine, a city of about 24,000 people circled by farmland and the Mississippi River.
The People's Daily, the Chinese Communist Party's official newspaper, noted that the delegation "visited elderly people in the local community, attended a birthday party, had six interviews with local media outlets and attended five welcome banquets held by the US side".
"I thought he was a very nice, focused, polite man," Eleanor Dvorchak, who hosted Mr Xi at her home during his stay, later told the BBC. "It was a pleasure to have him at the house."
The Dvorchaks put Mr Xi up in their son's bedroom - he was away at college at the University of Iowa at the time. If the Chinese president had an opinion about the room's Star Trek wallpaper, he has managed to keep it to himself.
IMAGE SOURCE, GETTY IMAGES
Image caption, The Chinese leader reunited with Muscatine residents including Sarah Lande (L) during his 2012 visit. In 1985, Ms Lande helped coordinate a visit to Muscatine for a delegation headed by Mr Xi