is it standalone model?

Hey nice truck still needs some fine tuning and more options, this is actually the model truck after the Brigadier called a GMC WG around early 90s , commonly referred to as a "White GMC Volvo" for they was all built by them manufactures or something like that, volvo bought up the operation made them a few more years or so google says in several articles, I'm drive this one alot great truck please update it and improve I also seen pics w a few w sleepers :)

HD video Test https://youtu.be/_stR-t-yKBc