@INeedMana@sh.itjust.works's starting point for building your own is pretty damn good.
To add, HTR should definitely not be there at the start unless this is some real serious business they're transporting. The kind of thing that might tank the company if stolen.
You should definitely figure out beforehand where the HTR is physically stationed and how long it'll take them to arrive by rotorcraft. A big part of the team's mission should be preventing/delaying the call to HTR and an escape plan if they are called.
Make it very clear they don't want to fuck with an HTR team. If they mess up enough that they end up tangling with them, remember: responses like that normally come with a Nissan Hound or similar for CAS, and they do not come lightly armed. Multiple HMGs with APDS are pretty standard.