Dual Extruder advice

First off, I just ordered a mk2 extended version, my first personal 3d printer (have used professional ones in grad school but excited to have my own!).

I bought it because I love the minimalist design and use of linear rails, however I'm wondering if anyone has upgraded to a dual extruder. I want to do this in order to print dissolvable supports, but I'm concerned that with the cantilever design adding mass to the end is probably not such a good idea.

So has anyone made this upgrade? If so what did you use and how is it working out?