Drop the Misc Item, named "A Truck Spawn Marker", from your inventory and follow the directions it gives you.

-4 "Trucks!" options, ranging from the original (and mostly defunct) swivel steering truck, to newer rack and pinion steering, and then to newer collision/physics after that. Progression lalalala.
-A "Bus!" option, which is kind of nuts...but fun (at least I think so).

Feel free to also try the:

-As of 4.00.00, has xBox gamepad/controller support (see Posts tab for more details about remapping/rebinding keys/buttons).

-It all is what it is, a "proof of concept" and a "work in progress". Keep your expectations low. 'This is not New Vegas XRE', lmao!
I'm honestly just happy it "works" as well as it does and, to me and mine, it "works" better than I'd expected by quite a bit. ¯\_(ツ)_/¯
However, I will totally say it would probably be at least a little helpful if there was much less clutter/junk strewn about the Commonwealth roads though...and better roads overall...and if Bethesda didn't use (or if there was an easy way to batch/bulk change them) default Collision settings (specifically Friction, Restitution and Radius) for all their terrain/objects, yeah...heh.

-This is a bit of a continuation of Wasteland Wagons. Check that out.

-Do not uninstall the mod while driving a vehicle. If you've uninstalled this mod before exiting the vehicle and caused your character to become frozen, hit the Tab Key, should fix it. Or, make new throwaway save, close the game completely (don't just lazy Quit To Main Menu), reopen it and load save. But, as a mod user, you really should know better than to do that in the first place.

-Do not load a previous save while driving a vehicle. But if you do and this has caused your character to become frozen, make new throwaway save, close the game completely (don't just lazy Quit To Main Menu), reopen it and load save..

-You cannot be damaged while controlling the things. Enemies should still try to attack you/the vehicle, though.
However, falling damage after getting out is still obviously a thing, it is preferable to Exit the vehicle on somewhat flat land...as there can be a fall when dismounting.

-The additional ESL file (ASAHavokTruckRevisitPatchPlayerToTruckCollision00.esl) included, in the main download .zip, is optional to enable. It is a patch to enable the vehicles to collide with the player/NPCs when not driving or when driving while using a view that does not show the player/character. I decided to keep that separate because it edits vanilla records (Collision Layers). It is helpful to use, though, as it'll keep you from walking through the vehicles when they're not in use.

-Mainly for 3rd-person view if using the original 'no visible player' view.
However, if use one of the 'visible player' options (available to select from vehicles' menu, if that vehicle has the functionality), the 1st-person/close 3rd-person is pretty good.

-If turn radius is not acting as normal (more loose/wide than usual), you can press the 9 key to cycle through (preset) adjustments that *should* get it to its normal tightness one way or the other. You can also try try getting out of the vehicle and back in, or destroying the vehicle and placing another to use. This function is only really for use when a user thinks the turn radius is not what it 'normally' is (this is 'not' meant for what a user might 'want' the turn radius to be).
Regardless, looking at this more.

-Started adding in weapons. Very basic setup (though a few have unique ones and a few don't have any weapon at all, but most have an exploding cannonball). Will probably flesh that out later with, if at the very least, some kind of mounted ""weapon""'ish looking thing so the projectiles aren't just spawning from 'the ether'. Anyhoo, press the F key/Right-Shoulder button to lob projectiles in front of the vehicle (or, in the case of the APC addon, shoot rockets from the turret...woohoooo! 'Blow'd 'em up real good!').

-Recently added Horn function, which is ALSO a weapon.
Tap Q key/gamepad button A for Horn, Hold it for 'Fuzz Do Beep!' (big AoE b00m!). Will probably do vehicle-specific ones eventually, but they all have the same one for now.

-Your character is not seen on the vehicles by default, but you can choose a few options to show the player character (expiremental) or Dogmeat/companion (VERY experimental) from the vehicles' menu.
Still working on getting better idles, though, and reusing some vertibird ones for now.

-It not supposed super fast...that's not what it's for, nor is it the point.
If a person constantly leans on the W key/D-pad Up (or, especially, W/D-pad Up plus the Shift key/Left-Shoulder button), especially downhill, the person is just being silly or has entirely missed the point of this.

-This, and its addons, is/are a proof of concept and a work in progress.
Although, we do feel that it works well enough to stay in your game long term if you choose (but we won't mind if you don't after you've tried it).

-Started adding sound setup. I don't play with sound myself, so this is anh pfft meh whatever. Even so, got a SUPER basic set of sounds going right now. However, due to that and that people also just might not like any sounds at all, can adjust (from loud to all the way off) the engine volume with the number 3 key. Feel free to ask if you want to make a patch for the sounds, I/we'd be happy to hear from someone interested regarding that.

-They haz teh headlights! Press 5 key/gamepad button X to toggle.

-Vehicles with visible steering wheels now have those steering wheels move/spin when turning left/right (and hitting a bump that would cause the wheel to angle, heh...Ummersionz!). Except the 'Wasteland Havok' addon's Highwayman Edge...I'll get to that one eventually...it's going to need a special setup.

-Some vehicles (in the framework or its addons) have extra available colors/textures/bodies/tires, which can be accessed from the LooksMenu of the vehicle (only if that particular vehicle has any optional Looks, of course).

-Vehicles stay where you left them (for the most part). You walk away and come back, they're still there. You close game, they'll be back when reopen game.
I'm not sure if we'll leave it this way or not. It'll heavily rely upon people cleaning up their own vehicles (ie; destroying them when no longer being used).
So, are we sure people are going to be doing that well enough? I don't know, it's a good question.

-They all share the same storage compartment/container, so if you destroy/lose one you can just build another to access their storage. Remember to clean out the storage before uninstalling the mods, of course, as you'll lose all the stuff in there if don't.

-Requires F4SE and Garden of Eden Papyrus Script Extender.

-Havok and low-FPS-potatoes do not play well together. Also it doesn't like people who turned off VSync (though goodness knows for what good reason they would have turned it off for to begin with. SMH my head), nor does it like that "High FPS Fix" mod.

-The silly little "EXPLOSION" explosion (and the sound it makes, lol), when choose to put away (Destroy) a vehicle, is absolutely intentional, heh. You don't like it? Ask to make a patch that changes/removes it.

-You *will* flip over and/or get stuck sometimes. There are buttons/keys to press to try to help with that when it happens. If you forget which keys do what, press the number 4 key while riding (NOT numpad 4, regular 4 at the top of your keyboard).

-Save early, save often...as in before you get in.
Also, don't try to load a previous save while in a vehicle but if you do and get stuck, close the game completely and reopen it to load your intended save.

-There is an optional file in the Files section, with some copies of worldspaces to goof around in (the worldspaces have lots of holes and floaty things, so really just for testing and goofing off).

-Truly, honestly, 4 realz, don't stand under a falling vehicle...really!
Also best not to close/save the game while standing directly next to a vehicle, either.

-There is a random crash when using the no-visible-player view option...can't pin it down...since this is all still WIP and 'proof of concept's, I'm not terribly worried about it at the moment. But, basically, the vehicle (super uncommonly and random'ly) 'Disable's, like, while still driving it and the game doesn't like when the thing the game camera is focused on Disable's so...<crash>.

-Imma say it once more, just for good measure. It is what it is. This is a proof of concept and a work in progress. Think not about what it should be or should do, please think about what it is and does do instead.

-Started working on adding more appropriate Driver animations and some flavor animations. A fun 'Slamming Horn' we're testing in the Jeep addon (1st Jeep in that addon's Spawn list) is credited to Bethesda Mod School Resources at https://www.nexusmods.com/fallout4/mods/38669. This will be a long while to do, if ever, so we'll see how that goes.