Depends on how often you'll be using that hitch rack.

You could either add an add-a-leaf to the rear springpack, or add a longer shackle (or both for that dragster look). Keep in mind by doing this your tail-end will be up higher when driving w/o the loaded hitchrack.

If you want to take the time to adjust the headlights each time, that might be cheaper, but a more-frequent pain in the butt.