The American meat and cold cut producer announced the hot
dog-shaped vehicles are being rebranded for the first time in
history in honor of the company’s new 100% Beef Franks,
according to a press release issued by the Kraft Heinz
Company today.

Now called Frankmobiles, a fleet of them will hit the highways
nationwide this summer and will have painted lettering that
references the vehicle’s new name and "all beef" frank recipe.
(FOX Business)

The Oscar Mayer Wienermobile has evolved from
Carl Mayer’s original 1936 vehicle to the vehicles
seen on the road today. Although that first
Wienermobile was scrapped for metal in the
1940s to aid the US Army during World War II,
in the 1950s Oscar Mayer and the Gerstenslager
Company created several new vehicles using a
Dodge chassis or a Willys Jeep chassis. One
of these models is on display at the Henry Ford
Museum in Dearborn, Michigan. (above)
(From Wikipedia)

Oscar F. Mayer died in 1955.