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I second the bottle jack as the first place to check. next is the tools in the rear door panel. Next super obvious thing is to check your spare is hitting your sway bar or is loose.I would start off by climbing under the back of your GX and visually inspecting all the suspension components also giving them a wiggle by hand to see if anything is worn or loose. Could also be the spare tire not being secured tightly. Have you checked your seat belts? I've had my seat belts not retract fully and would make a slight clunking noise up against the interior trim. When I deleted my 3rd row, I removed the 3rd row seat belts completely for that reason. The very last thing I could think of is your factory included bottle jack. On the GX they're known for causing a rattle or clunking sound if they loosen up in their storage location.
Love an easy peasy fix!Found it...my camper hitch was moving around with no load on it.