Well, I took the plunge.
Since I wasn't happy with the progress of scratch building everything as my first build I ended up with buying a kit, Tamiya Grand hauler.
Not that terrible expensive and the length suits my needs.
I also ended up on drawing up the frame and crossmembers in Fusion360
https://cults3d.com/en/3d-model/game...d-hauler-frame <- Link if anyone wants to check out.
Just to make everything easier in the long run since I want to put my own dup bed and cab and don't want multiple holed all over the chassis.