I'm just seeking confirmation that when using a skin pack/custom series, it still uses the stock vehicle physics. For example if I use the 2016 Boxer Cup Australia skin pack+series, it's still using all the latest and updated stock Boxer physics or do some skin packs use outdated config settings and physics?
As far as I know, yes. I did some skinpacks that way, you just need to assure your VEH files point to the same physics files that a default-content VEH does. That's the case with all Boxer Cup skinpacks in RD, all Stock Car Brasil, V8SC, Montana, F-3, and so on. And If you're doubt about a specific skinpak, just check the VEH files to confirm by yourself. Regards.