There is no relationship between the points and any cargo proxy (or driver, gunner or commander).
well that isnt strictly true of course, because you can attach memory point to a proxy and this prevents you boarding at the back of the vehicle ,when you clicked at the side door. and ensures you get out at the right point too.
example is from my side guns and searchlight on an aircraft .
proxyIndex = 1;
gunnerName = "Left Door Gun";
memoryPointsGetInGunner = "pos_gunner";
memoryPointsGetInGunnerDir = "pos_gunner_dir";
proxyIndex = 2;
gunnerName = "Right Door Gun";
memoryPointsGetInGunner = "pos_gunner_2";
memoryPointsGetInGunnerDir = "pos_gunner2_dir";
proxyIndex = 3;
gunnerName = "search light";
memoryPointsGetInGunner = "pos_gunner_3";
memoryPointsGetInGunnerDir = "pos_gunner3_dir";
this way you will start your animation facing the propper way and also start the animation Getinlow in the right place