I just installed a Curt receiver hitch from JCW on my 84 TD. cost about $195, shipped. the unit for sedans is way less, like $140.
install was pretty straight forward, drop the bumper, mount hitch using some of the bumper mount pionts, hang bumper.

I had the bumper mount style hitch- worked great until I got rearended- then I didnt trust it any more, I had to reinforce the bumper mounts while I had it off- the bodyshop wouldn't touch it.

I have towed well over 1000lbs with no issues.

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1984 123.193 372,xxx miles, room for Seven.

1999 Dodge Durango Cummins 4BTAA 47RE 5k lb 4x4 getting 25+mpgs, room for Seven.

I've got a factory hitch or the CD, like a few have mentioned, bolts to bumper and trunk, holes pre-drilled.
pawoSD, that looks pretty good.

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83 SD

84 CD

do a search....I posted a ton of pics of my home made frame mounted hitch for my old 123 wagon. It was solid, Class III type construction, it will pull a tree stump outta the ground.

Oops, I just did a search, not many detailed pics of my old hitch, but I didn't search the archives too extensively.

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1987 300TDT
1981 VW MKI Caddy 1.6 diesel, waiting on engine swap
1983 D-50 Power Ram 4x4 "Mitsubishi" 2.3 turbo diesel
assorted gas powered crap and motorcycles

RIP: 1984 300TDT, 1982 300TDT, 1984 190D 2.2, 1992 300D 2.5, 1987 300TDT, 1982 Maxima LD28, 1983 Maxima LD28, Isuzu C223 P'ups X3, 1983 Holiday Rambler 6.2 Banks turbo diesel, 1984 Winnebago LeSharo 2.1 TD, 1985 Allegro 6.5

Photo of the hitch on my 300SD. Attached at the bumper and at the spare tire well.

I've never used it in the 6 years I've owned the car but the PO pulled a small pop up camper.

Attached Thumbnails

 

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Joe

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1980 300SD - 495k miles - 'The Ambassador'
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Former Family Members
95 C280
73 280SEL
90 300D
87 300SDL (X2)
86 560SEL
84 300D
80 300SD