That's a big truck.
One way to get around the frost heaves is to install a piece of pvc around the fence post depending on the size.
This will let you install the posts and not be imbedded in anything. Then you can let the bottom drain and just shim the post in when your ready with some loose stone dust or pea stones in the pipe.
Don't forget to treat the bottom of the post where it will be buried. I know it's PT and the injection process is alway's flawless
but this is an added measure worth the $10.00.
one thousand way's to eat a squirrel.......