I use a lot of FLEET products in my trucks but have never heard of a PRE-CHARGED antifreeze? Really? I dont mean to be negative but I wouldn't worry about it much just go out and buy any decent grade of full strength anti-freeze cut it 50/50 with water and fill up you cooling system, when full start the truck with the radiator cap OFF and let it run till it is fully circulating the coolant (you may need to cover the front of the radiator with a blanket so it will get warm) while the truck is running keep adding coolant until fully circulated, heater core etc. put cap on and your done!
KK