Store random generated stuff in vehicle and retrieve

[thund3rbird23]

I want to store random generated number when I click to the vehicle.

I attached a crate to the player's hand when a progress bar reaches 100% and if I click to the vehicle it's destroying.

What I'm needed:

Random generate a number which is storing when I click to the vehicle and retrieve that number when I click to the vehicle again or make a gui when I click to the vehicle and displays "store" and below "retrieve" so if I click to the store button then stores the number if I click to the retrieve button then retrieve that number or something like that.