I don't know. I'm never sure about things like this. I just wonder if they might could.

source: 
Mishoe
Entry: 
104
Example: 
I don't know. I'm never sure about things like this. I just wonder if they might could.
Modal 1: 
might
Modal 2: 
could
Gender: 
Male
Race/Ethnicity: 
White
Age: 
50s
Level of Education: 
Unknown
Home Community, Town, or State: 
Unknown
Location Collected: 
SC/ NC (Unknown)
Year: 
c1990
Relation to Addressee: 
customer to clerk
Medium: 
Spoken
Sentence Structure: 
1.4
Status: 
Naturalistic
Notes: 
Rest of comment from #103 speaker.