I have serious creeking sound when driving... also when I rock it back and forth

There are several possibilities .. We can narrow it down to anything that moves while driving or rocking the vehicle .. However that's not much help .. Since the noise can actually be duplicated by rocking the vehicle .. Suggest having it hoisted on a drive-on lift so the noise can be pinpointed by listening and then confirmed by spraying lubricant onto suspected component(s) 'one at a time' .. That is IF visual inspection doesn't reveal the issue.. Some repair shops will also be equipped with a device called a 'chassis ear' that is a very useful tool for diagnosing this type of problem as it can be attached to several different areas/components that are suspect then listen to each of these attachments through selectable channels.

best to bring it in to a shop to find out. shouldnt be much money if anything. good luck