This mod increases the health value of the destructible vehicles lying around everywhere. Cars have 2500 hit points instead of 500, and the Trucks and Vans (wherever they are) have 4000 hit points instead of around 1000. The initial, small explosions for each vehicle I left alone, but I changed the final destruction stage threshold from 50% to 25%; this means that not only do the vehicles have more health, but they must take a greater percentage of damage before exploding.

This is for those of you who use damage-increasing mods and have found the scattered automobiles just a tad too volatile for your tastes.

Made with FO4Edit 3.1.3 and largely untested, but since only two values for each vehicle are different, if something goes wrong, then either FO4Edit or your game is seriously borked beyond all reason. I sorted the Movable Static tree in FO4Edit by Editor ID and Name to find "Car," "Truck," and anything else that's a destructible vehicle, so I may have missed some vehicles.

If you find any vehicles that explode just as easily as they did prior to installing this mod, let me know in the comments. If anyone knows of a way to make destructible objects invulnerable to anything other than explosives, comment about that, too.

Installation:
Use NMM or your manager of choice; the folder structure is standard, but contains no installation scripts, fomod, etc.
If that's not your cup of tea, merge the Data folder in the archive with the same in your Fallout 4 root folder.

Aaaaaaand a video preview of the effect: