Lets see,,,I tow in 2wd, I have a limited slip rear end and have nevr had a problem.
Dont ownadually,, cant help ya there !!!!!
1999 Silverado 2500 6.0 L 10,000
I get about 10 MPH gallon running around town, and 15 MPH highway all non towing.
Towing I still get 12 MPH on the highway.