I'm not sure if i understood correctly what you mean, Are you talking about having a config to move the tag axle near the rear axles ? If yes there is already a config for it i think ! :D
Ohh alright i see, there is already a config for this in the pack indeed ! So you will be able to configure your truck in game to make it look like the one in the picture 😁 i've only edited the Ontario tri axle option to make the wheels fit with the diamond plate fender ! So any other config in the frame section is not modified(as of now, i might modify/add other configs in the future !)