Look very closely for rust. Many have cancer directly above the
rear jack point, bottom of the doors and around the front fender.
These are the areas I have to fix on my daily driver.
A weak point with these cars. If it is solid I'd bite.

__________________
1980 300SD Manganese Brown Metallic Clearcoat 248k
1979 300SD White 148 k
1984 300D Silver project car for daughter
1982 300D wrecked
1980 300SD 310K not running