[rotorwrench]

With the clutch engaged and the transmission in neutral, only the output shaft turns. As long as there is oil in the gearbox and rear axle, no harm will come to the drive train on a short run. U-joints should be in good shape and lubed too. Long runs may not supply enough oiling to the transmission output bearing or the bearing inside the input shaft.

My concern about this is that tires are one of the most important factors for road safety. Bad tires can cause problems whether driven or towed but it may be multiplied under tow. If no one is in the truck during the tow, it would be a disaster. If someone is in the truck, they better know what to do if a tire blows. A rear dual set up may save the day unless both go at once but a front tire directly affects steering capability. I don't know if a tow dolly is rated for that kind of weight. A person should check.

Taking a substandard vehicle to a parade may not be the best idea. Trailering there would be better since parades are usually very slow any way but it would be embarrassing to hold up a parade if a tire let go. Brakes are also a concern not to be taken lightly.