You don't need to go 70mph to regen a Tesla. They went fast in the article in order to get the wattage up to an impressive article-worthy number. 20mph would

You don't need to go 70mph to regen a Tesla. They went fast in the article in order to get the wattage up to an impressive article-worthy number. 20mph would work but more slowly. There shouldn't be much if any shock loading because the towed vehicle will be on the brakes the whole time. Obviously some good judgement is advised. Roads with hairpin turns or the shoulder of a major urban interstate is not the place for this. Obviously a tow bar would be better than a rope but nobody winds up in a situation where they need to regen tow a vehicle because of an abundance of alternative good options. I guess I was a little too generous to HN when I assumed I didn't need to include a bunch of "be reasonable about it" disclaimers in my original comment.