Three people were arrested, and a number of vehicles seized, when police swooped at two caravan park sites and a residential address this week.
The joint action involved Thames Valley Police, HM Revenue & Customs and the RSPCA.
On Sunday morning officers attended pitches at Calverton Caravan Site, arresting a 37-year-old man and two 16-year-old boys, all of whom have been bailed until 28 March. A van, a motorbike, two stolen golf buggies and a TV monitor, all suspected as stolen, were also seized at the site.
This morning they returned to the Calverton site, executing two warrants and seizing suspected stolen power tools.
They also visited an address at Peartree Bridge in Willen, with HMRC officers recovered three vehicles fuelled by red diesel, while the RSPCA removed five dogs from the premises due to their poor condition.
Newport Pagnell neighbourhood Sgt Andy Paulden said: “Today was a really positive result of working successfully with our partner agencies.
“HMRC seized three vehicles containing red diesel, and a number of animals were removed due to their poor condition by the RSPCA.”