The Royal Guard is tasked with protecting me (the king), and the family from all would be adversaries. The Royal Guard will protect the residence which will also be the political house of the government. They will also cook, clean, and perform administrative tasks. The Royal Guard will however also include military trained personal with how to function as a fully protection force. Despite what one might think, the Royal Guard is not a private army, but a branch of the military with one task. The Royal Guard will not be used for example to assassinate someone. That would be the job of Special Operations.
The Royal Guard will have a number of vehicles that would look like civilian vehicles, but hardened to be bullet proof, and therefore more resilient. When possible, hydrogen fuel cell will be used to fuel these vehicles, and the vehicles will be located on the private residence of the royal family. For automobiles, there will be hopes to have a domestic auto manufacturer. The policy of the government will be to buy domestic when possible. This will also apply here as well. Such an example might include KAA which will be located in another subdomain. Even if the automobile can be acquired by a domestic provider, there is more likely a need to completely overhaul the vehicle to offer protection to the royal family. Also, escort vehicles will also be acquired by the same company.
For aerial vehicles, there will be a cargo aircraft that would be used to transport the royal vehicles ahead of the monarch. This will likely include a sedan, and 2 SUVs with some reliance on the host country to provide additional security.