Remove all non-cup mods (except CBA) and retry. If the error persists, one of your CUP mods got corrupt at installation. If that's the case, re-download and reinstall.

Added missing

gearRetracting = 0;

In the beginning they where not meant to be disassembled and for base / compound / base protection. This is why they also have such a high ammo count.
I don't think that making them portable is very useful since it has a ROF of roughly 4000 and that would require quite some people to carry the ammo for a 1min action.
I might look into ways to disassemble the weapon into several boxes that then could be used for vehicle transport. -> Wishlist priority

Your question has been answered twice already: it is not possible

Not one compatibility mod was loaded, not for CUP nor RHS

Nothing to fix. RHS uses values and configs closer to IRL where CUP is arma 3 vanilla oriented.

TI view in turned out position is fixed

When you turn out from the Communication Operator Rear FFV seat, you're still sat in the same place and the vehicle disappears from around you.

Removed

Added vanilla hitpoint config and values (for testing) of the Ghosthawk.
Model.cfg slightly reworked.

Model no longer required, alternative model is used

Fixed: Typo in proxy path

Wrong Ticket Category

Wrong Ticket Category

As said, that is not possible.
This would require way too many reverting changes to way to many objects and even more lines of config for us.
The only way to use CUP on Linux and Mac machines is, to use "Proton" by Steam and the latest build of Arma 3.

Make sure you are running only CUP mods for troubleshooting. If the error persists, you most likely have a corrupted mod installation (CUP Terrains - Core) -> Redownload

Another Bump and you're done

they would make some nice props indeed

This could be added to the LoadOrder i guess.
No idea if it works with strings, that's up to people with bigger heads like me to find out :D

Useless "feature". Why would anyone mount another scope other than the dedicated spotting scope....?

Sure, if you make one? We don't take wishes tho...

Both, BTR-80 and BTR-80A have HE. Use the scroll wheel menu ro reload HE shells.

Intended behavior. Pilots can use it very well

No intention to do so atm. Not really part of the old Arma lore.
Wishlist priority for now...

Fixed in dev branch, will be available with upcoming hotfix