@shaderphantom actual answer? Cause I know the actual answer to this <_<
@shaderphantom oh, fold down your back seat, passanger seat too if that gives you more space. Leave the ladder sticking out of your trunk, bungee corded or similar to keep it from sliding out. You'll want to add a red ribbon fluttering off the bottom rail or wahtever sticking out.
If you go to a home depot or another hardware specific store they should be able to help you with that, or offer other solutions.
@Draekos @shaderphantom You may also be able to rent a ladder if you don't know if you'll consistently need one after this round of battery changing