If you sell that bike you will regret it forever!!!
And I know this from personal experience!
The wife wanted a HD about 17 years ago, and I have been in-prisoned to that for too long. After 8 Harleys for me, and 4 for her, she has finally decided that an ATV better suits her, and I am trying to sell my 2011 Glide limited, with no success I might add, and get a dual sport.
Saying all that to say this.
The tandem tow dolly works great. We have been able to tow two HDs and a car around as much as we want. I will be selling ours in October because we will have two ATVs and a dual sport bike, which simply will not fit on the deck of the tandem tow. If I wasn't doing all that I would keep it forever. They are not too easy to find used, but we got lucky a couple years ago. If you can find one used, get it and you will not regret it. Tows like a dream, and is too easy to load!!