an uncanny minivan density

in the fading darkness, a Grand Theft Auto moment:
an erratic caravan
(or town, country)
driven transsuburbially
light green, light grey or beige
swerves across painted perforation
joins a tumour of littermates
six noses
for two pumps
of unleaded

I actually saw this at about 6:45. Literally, a half dozen could-have-been-identical minivans, all pulled haphazardly into a Marathon station. Fleet vehicles? Soccer-mom convention? Elaborate hold-up?