Well the owners manual would be the best place for the info ; and it sounds like reading the manual doesn't give you the info you're after.
The two speed transfer case would have a Neutral position , to shift to for flat towing.
Does the shift mechanism in the vehicle have a neutral setting ?
Does the transfer case have low range ?
Before I retired ( 2007 ) Jeeps with Quadra-Trac couldn't be flat towed , but that was a long time ago.