This is the Gavril D-series Quad Cab! After extending the D-series in Blender because I got bored, I saw potential and made it into a full mod.
It also includes a special "rocket" edition. I'll let the video speak:
Press "O" to open the tailgate, then press "T" to activate the JATO rocket.
It includes everything you'd expect, such as an extended frame, extended driveshaft, extended muffler, extended trim, and extended running boards. The extended running boards are a bit shaky, that'll be fixed soon.
This resource is still beta, so I'm going to be pushing out updates now and then. Suggestions and bug reports are welcome but go in the discussion tab.
edited Jbeams for good crashes
I'd also like to point out that most skins work, but some more complex ones don't.
Beta Gavril D-series Quad Cab 1.2
Extended body with eight doors