Replacement Body Bushings

[underliner6]

I am in the process of replacing the body bushings on my 72. I have succesfully replaced all of the bushings except for the rear two by jacking up the body from the rockers.

What is the best place to jack up the rear to access the two bushings next to the gas tank? I'm worried that if I jack it from the bottom of the tailgate, even with a piece of 2x4 under it, it's going to put too much stress on the tailgate.

What my best option here?

Jim