I'm thinking of setting the car up for flat towing.
Depending on the state(s) in which you're towing, the weight of the towed vehicle, and the ratio of the weight of the towing vehicle to the weight of the towed vehicle, you may be legally required to use a braking system in the towed vehicle. It's not necessarily a bad idea anyway. I use an older BrakeBuddy but there are other systems out there as well. The RV community is a good source of information on this, as they're nearly the last bastion of flat towing in the US these days.
I decided to run a separate set of towing lights on magnetic bases, shown here on the roof, rather than mess around wiring a dual system into the original tail lights. I'd mount them lower if the car had any good flat surfaces down there but even as it is they're still within legal spec.
1982 MG Metro 1300: IOE 2015 Pacific Northworst GP, Longest Distance 2010 Cd'L Box Wine Country Classic
1980 KV Mini 1: Worst of Show and Fright Pig Supremo 2009 Concours d'Lemons
1978 H Special: Second-Round Elimination 2010 Lemons Pinewood Derby at Sears Pointless
1967 SAAB 96: IOE 2012 Pacific Northworst GP