They used to would stack it.

source: 
LAGS
Entry: 
719
Example: 
They used to would stack it.
Modal 1: 
used to
Modal 2: 
would
Gender: 
Female
Race/Ethnicity: 
White
Age: 
76
Level of Education: 
6th grade
Home Community, Town, or State: 
TN (Rocky River)
Location Collected: 
TN (Spencer)
Year: 
1973
Relation to Addressee: 
subject to fieldworker
Medium: 
Spoken
Sentence Structure: 
1.0
Status: 
Naturalistic