I don't have the DLC yet, but will GRA not run without all the patches on PS3? I hear it won't and I don't to install any patches, they mess EVERYTHING up on the PS3.

I don't have a PS3 so I can't say for sure, but the http://fallout.wikia.com/wiki/Fallout_New_Vegas_patch_1.7 seems to suggest that you won't be able to run it or Lonesome Road without the most recent patch..

I have a PS3, basically this is what I've got- Lonesome Road, Old World Blues, GRA, Couriers Stash. I think i have the patch, it's like 300mb or something like that

I downloaded GRA and then uninstalled the patch to try and exploit something.

Turns out all my Lonesome Road and GRA gear disappeared.

Reinstalled the patch and they returned.

I didn't install the patch for Lonesome Road and it ran fine (mostly), so maybe, once you install the patch, you can't uninstall it?