Bradford Build Workbed for Box5Diesel's Dodge Ram, by Takanix (Iceman [U.S.]).
Readme written by CuriousMike.

Step 1:

Extract the contents of this zip into a new folder. 

Step 2:

Open the BoxDodgeRam zip and add the 3 `.mesh` and 2 `.dds` files from the folder to the zip.

Step 3:

Extract BoxDodgeRam.truck from the zip into the folder and open it in Notepad or your preferred text editor.

Step 4:

After the `guid` section, paste the following:

managedmaterials
ICD_bb_work_bed_lights		mesh_standard		ICD_bb_work_bed.dds		ICD_bb_work_bed_s.dds
ICD_bb_work_bed_plastic		mesh_standard		ICD_bb_work_bed.dds		ICD_bb_work_bed_s.dds
ICD_bb_work_bed_metal		mesh_standard		ICD_bb_work_bed.dds		ICD_bb_work_bed_s.dds
ICD_bb_work_bed_chrome		mesh_standard		ICD_bb_work_bed.dds		ICD_bb_work_bed_s.dds

Step 5:

Under the `props` section, paste the following:

17,14,2, 0.675, 0.5, -1.75, 0, 0, 0, ICD_bb_work_bed.mesh

Step 6:

Under the `flexbodies` section, replace BoxDodgeCummins.mesh with BoxDodgeCummins_cab.mesh 
and BoxDodgeCumminsLights.mesh with BoxDodgeCumminsLights_cab.mesh.

Step 7:

Also in the `flexbodies` section, add a ; before the following:

90,88,92, 0.5, 0, 0, 90, 0, 270, BoxDodgeCumminstailgate.mesh
forset 88, 90, 92, 93

90,88,92, 0.5, 0, 0, 90, 0, 270, BoxDodgeCumminstailgateB.mesh
forset 88, 90, 92, 93

Example:

;90,88,92, 0.5, 0, 0, 90, 0, 270, BoxDodgeCumminstailgate.mesh
;forset 88, 90, 92, 93

;90,88,92, 0.5, 0, 0, 90, 0, 270, BoxDodgeCumminstailgateB.mesh
;forset 88, 90, 92, 93

Step 8:

Under the `exhausts` section, also add a ; before the following:

exhausts
;ref node, direction node, factor material
112, 113, 1 default
112, 113, 1 default

Example:

;exhausts
;ref node, direction node, factor material
;112, 113, 1 default
;112, 113, 1 default

Step 9:

Save the file then add it back to the zip. Enjoy!