Cheese car, cheese mobile

Does anyone know what a cheese car or cheese mobile is?
2 guys are talking about a stationwagon-type car.

A)What is that, a Dodge Neon? Is that a K-car?
B)It's a stationwagon.
A)It's like a cheesemobile.
Like the one for suburban families.
A)Look, it's Chrysler, It's just a cheese car.

Does it mean a stationwagon for a specific purpose?
Than you in advance.