I did not know Remco got of of the drive shaft coupling business. Below is from their web site. They use the word MAY need ... I have only towed ours short distances and we just towed in neutral. Some require to start the engine every 300-500 miles when towing flat.
2003 Chevrolet S-10 LS RWD V6 4.3L cyl 5-Speed Manual Manual
2003 Chevrolet S-10 LS RWD V6 4.3L cyl 5-Speed Manual Manual
Notes
This vehicle may need a drive shaft to be towed with all four wheels on the ground. Remco Industries no longer sells the Drive Shaft Coupling (Disconnect). If interested in a Drive Shaft Coupling, please contact Southwest Drivelines (http://www.swdriveline.com) or David at Drive Shaft King (800-442-6329).