How to convince my parents to let me buy a truck

I'm 16, they are gifting me the truck that my sister used befor me, a 2008 Ford F-150. It has 250xxx kilometres, lots of dents, and electric issues. I have some money saved up and am looking at buying a 1981 dodge d150, which has 85xxx kilometres, and is in much better condition. How can I reason with them to let me purchase my own vehicle, I will have to pay the insurance either way.

Odds are, you are going to crash your truck. Drive the PoS for two to three years, and then buy the truck you want.

Tantrums could be an option.