Mr. X and Mr. Z are good friends, and they are always there for one another. One day Mr. X needed a bakkie and he asked Mr. Z if he could use his truck for a few days to move from his old house to his new house where he will be moving in with his partner. Mr. Z did not hesitate to agree since he trusted his friend to take care of his car as though it was his own. Mr. X's partner suggested that they should also ask for all the necessary documentation from Mr. Z so that they can get insurance for the truck just in case something happens. Briefly explain to Mr, X and his girlfriend why they cannot take insurance on Mr. Z's truck.