I don't know what to tell you man, I just went back and tried pretty much every truck/car on the official modhub and it worked just fine. You must have a mod conflict, or all "50" plus trucks your talking about are not properly set up for Farming Simulator 22. Hope you find a solution.
Not working for me either when not using your truck. Dont use manual attach either. That said your mods are pretty much the best quality there is imo so not complaining. appreciate the work you do.