From what I’ve read, the “fire suppression system” would need to weigh much more than the vehicle payload.
Fire departments figure 40,000 gallons of water for one electric car battery fire. So this would probably take 160,000 gallons at 8.3 lbs/gal. Well over a million pounds of water.
Good answer. Now all someone has to do is invent a light fire suppression unit for batteries to make it safe to go out on the highway.
There has been high wind warning which all the weight would help trucks stay upright.