Dodge Ram Truck 2008 Owner's Manual page 442

440 WHAT TO DO IN EMERGENCIES
CAUTION!
Towing faster than 30 mph (50 km/h) or for more than
15 mi (25 km) can cause severe damage to the
transmission.
If the vehicle is to be towed faster than 30 mph (50 km/h)
or more than 15 mi (25 km) the vehicle must be towed
with the rear wheels raised and the front wheels on the
ground. It may also be towed on a flatbed or with the
front wheels raised and the rear wheels on a dolly.