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For a few years, the Retriever was still badged as Bison or Parks-Bison, but by the late 1980s became known simply as the Peerless RT-6. The Wrangler stationary packer line was carried over, and a cart dumper attachment also joined the lineup. In 1987, Peerless obtained the rights to build the Magnum chain-lift roll off system. Around 1995, Peerless sold the division to Oregon Western Industries (OWI), and relocated to the Paragould, Arkansas factory. Thereafter, Peerless would concentrate on their transfer trailer product line. Johnn Knapp left Peerless around 1988 to found Advance Design Research (ADR) in California. See the OWI, FORCE-MAGNUM and ADR pages in the links below 
Early Peerless Retriever models were still badged as Bison or Parks-Bison for a few years 
Peerless Retriever satellite side loader (courtesy of Thrash 'n' Trash Productions) 
The 34-yard portable transfer station option was carried over from Bison 
Peerless introduced a cart dumper under the Bison Products Group 
The Wrangler system was another product carried over from Bison 
By 1987, the Bison name was dropped and the side loader became a Peerless-badged product 
1977 Mobil-Dump, one of the Peerless landfill equipment products built before acquiring Bison. 
1981: Peerless products included trailers to 134-yards , including walking floor types Sunrise Sanitation's 1988 Peerless Retriever on International S-Series (Video courtesy of Western Oregon Garbage Trucks) SELECTED PATENTS
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