276855cb_Grand_Theft_Wiki__the_GTA_wiki__Description
[Unique trait] Heavy [Code] H [Description] 
The vehicle's mass is greater than it should be normally. The car will feel "heavier" and will lose less momentum when colliding into dynamic objects. However, heavy cars are more susceptible to damage and will only take two or three hits before starting smoking or even exploding. This property cannot be saved in a garage.
Special Vehicles in The Ballad of Gay Tony - Grand Theft Wiki, the GTA wiki
Description