+1
I think the bigger issues will be corrosion, corrosion and corrosion.
Check underneath! ( as said above. )
My car has air suspension - all 4 struts have been replaced. If they have, then fine. If not it can be expensive.
I like my ML system. Speakers are more the issue I think.
Best thing I did was search and read this forum - it really helped.
Choose wisely - there are lots (less so now) of old nice ones and lots of old bad ones.
Great levels of equipment does mean many things can go wrong.
However, love my (air suspension) old RX.