Jack, if it were mine I'd unhook the driveshaft and take it out just to be sure. Not worth the risk, IMO. Some of the RV places tell you to start the tow'd vehicle, shift it to drive and ensure it engages, then shift to neutral and shut off the engine. The truck rental places (Uhaul, Penske) say drop the driveshaft on a 2WD. I'd say use my trailler, but it's a heck of a commute!