Answer:

MODELTS

Answer	Crossword Clue
MODELTS	Old Fords
MODELTS	Tin Lizzies
MODELTS	Early assembly-line cars

MODELTS	Groundbreaking old Fords
MODELTS	Ford classics
MODELTS	Early Fords
MODELTS	'20s transportation
MODELTS	Collectable cars
MODELTS	Common '20s cars
MODELTS	Early assembly-line output
MODELTS	Much of '20s traffic

MODELTS	First successfully mass-produced cars
MODELTS	Antique autos
MODELTS	Top sellers of the 1920s
MODELTS	Ford best sellers
MODELTS	Cranky cars?
MODELTS	Early Fords that "put America on wheels"
MODELTS	Early assembly-line items
MODELTS	Bestsellers of the 1910s

MODELTS	Tin lizzies