Heavy Truck Pack- Fexcraft Addon
The Heavy Truck Pack is an add-on for Fex's Vehicle and Transportation mod, currently adding four brands of trucks, coming out to a total of 11 different individual models. Also included is a flatbed
gooseneck trailer. Various components can be added to the trucks, such as hitches, a toolbox, a lumber rack, a headache rack, or towing mudflaps. The beds, trailers, lumber
rack, and toolbox all have storage slots available for tools or materials. Each truck has glowing headlights, tail lights, running lights, blinkers, and reverse lights. Each truck's primary color can
also be changed to any RGB value, allowing for customization. The following models are included:
-2017 Chevy Silverado 2500HD and 3500HD-
These were the first trucks I modeled, boasting a Duramax diesel engines and the iconic gold bowtie. 
-2020 Chevy Silverado 2500HD and 3500HD-
I know many people aren't a fan of the look of these models, but personally I do somewhat like them. 
-2017 GMC Sierra 2500HD and 3500HD-
These trucks are mechanically identical to their Silverado counterparts, but have a distinct set of headlights and grill.
-2017 Ram 2500 and 3500-
The Ram truck line has the iconic cross in the grill and rugged look, boasting Cummins turbodiesel engines. Tow mirrors extended, of course.
-2018 Ford F-250 and F350-
The super duty line is not one that I like, but they are iconic American trucks. 
-2020 Chevy 5500-
The medium duty Chevy Kodiak line was brought back in 2019 with the Chevy Silverado 5500 chassis cab. Three beds are currently available for this rig- a dump body, dump body with toolbox, and a stake body.
-Big Tex Gooseneck Flatbed-
Commonly used for hauling machinery, hay, and other goods, this flatbed attaches to a hitch in the bed of a pickup truck for serious hauling.
Installation
1. Run MC 1.12.2 at least once, and set your RAM limit to at least 2GB. I'd suggest this for any modded and/or Forge installation.
2. Download a copy of forge from here<link to installer>.
3. Run the installer. It should install Forge automatically and setup a Forge 1.12.2-XXX profile in the launcher.
4. Install a copy of the following by downloading and placing in your ".minecraft/mods" folder: FCL, FVTM, and GEP.
5. Download the Heavy Truck Pack and install it like the others. (Note- if you do not install the above mods, you could lose functionality of fuels or even not be able to run the game at all, depending
on which mod is not installed)
6. Run the proper version. The mod should be installed, and there should be a "Heavy Truck Pack" tab on the second page of inventory.
FVTM Basics
FVTM and Fexcraft were coded by Ferdinand, link to his discord here. He's done a great job with his mods, and is very responsive when contacted about bugs. If you have any issues reguarding his
mods' functionality (not pack visual or config issues), contact him or contact me via DM and I'll reach out to him for you. This being the add-on that it is, here's some information reguarding his mods:
[B]Road Generation
FVTM has an excellent sloped and curved road generator, building slopes with 16 different levels of asphalt. Width is determined by stacking road creation tools (stack of 5 yields a 5 wide road).
Simply click points along a path, and double click on the last point. This will finish the road segment. I've found that it's much more accurate when doing short sections of very curved roads.
Constructor
The constructor and lift is used to modify and paint vehicles in any FVTM addons. To modify a vehicle, right click on the constructor with the vehicle in your hand.
Const. Status- This tab allows you to autoconnect to the nearest lift, which will show the vehicle in said constructor.
Content Info- Name and other information of the vehicle.
Part Cache- If you right click and place a part in the constructor, but do not attach it to the vehicle, you can view it's information here, remove it from the constructor, or install it.
Part Manager- Here you can view the currently installed and default parts, and remove them. Some parts are unremovable, an example would be engines or most cabs.
Part Installer- Fairly self explanatory. Allows you to install parts to a custom category or a defaulted category.
Texture manager- Allows you to switch between various textures. None others are currently implemented in the HTP.
Spraying tool- This is where you are able to set the primary color RGB of some vehicles in FVTM. All the vehicles in this pack are enabled.
Vehicles
Vehicles are part based in FVTM, allowing lots of customization and modification. They also have functions or "programs". These would include lights, or for other packs, animations or tools.
All of the vehicle's programs are available by pressing "k" while in the driver's seat. The default programs are lights, brights, fog lights, blinkers, and hazards. The trucks in the HTP only have
lights, blinkers, and hazards currently implemented. "L" can be used to toggle between no lights, lows, and brights. While in the vehicle menu after pressing "k", use the scrollpad to select a function
and left click to activate. Right click deactivates. For the blinkers, left click is for the left blinker, right is right blinker, and ";" deactivates the blinker function.
By pressing the "R" key, you can access the vehicle inventory and menu. Here you can view any status or information about the vehicle, access the storage inventories, and fuel the vehicle. To fuel
HTP trucks, place a diesel fuel can from the GEP in the box under "fuel". It may take a while, as these trucks hold a very large amount in their tanks. Inventories are split into categories, depending
on the vehicle. The pickup trucks in this mod have a dedicated "bed" inventory. The Chevy 5500 has beds that can be installed, and each adds an inventory. The toolbox and lumber rack each add an
inventory in addition to the bed, under the "bed_accessory" category. 
FVTM has a driving system that is much different than most. The "W" and "S" keys increase the throttle and decrease the throttle, respectively. A throttle will remain where it is left at until the
other key is pressed to change it. Turning is much like turning a vehicle- it takes some getting used to. Turning is not immediate, either. To turn on/off the engine, press "ctrl".
Brake and reverse lights glowing.
Turn signal functionality.
Towing and Connectors
To tow a trailer, you'll need to attach a hitch (the gooseneck hitch for HTP) on the "rear_connector" slot. If you right click the constructor with a hitch, this option should come up automatically.
Once the hitch is installed, back the truck up until the hitch and the trailer coupler are within (roughly) the same block. Turn the engine off with "ctrl", and press the number "0" to attempt to
couple to the trailer. If it won't couple, you probably didn't stop the vehicle completely or the hitch isn't close enough to attach to the trailer coupler. To uncouple, come to a stop and press "0"
again.