Q: Clumping or bottoming out noise on hard bumps

Hi there. It definitely sounds like the bushings you mentioned could be the cause of the noise. However, worn shocks/struts can create a similar feeling or noise if they are worn out and not providing the dampening force necessary to slow the suspension travel; thus the suspension will "bottom out" and create a noise. The shock/strut has oil valves, piston and base valves, that allow oil movement inside the shock at controlled rates to provide the dampening/slowdown of suspension travel. A weak/worn/broken shock/strut can exacerbate the condition leading up to bushing failure. Suspension bushings also allow some movement of the suspension components while providing dampening from sudden movements; when worn out or broken these allow excessive movement and/or noise. A good visual inspection of the bushings and suspension system should uncover which/how many of the bushings/parts are worn. I strongly suggest having a qualified technician perform an inspection to avoid replacing unnecessary parts. Your Mechanic has several available technicians that can assist you with a clunk noise from the rear inspection [https://www.yourmechanic.com/services/clunking-noise-when-i-drive-over-bumps-inspection].