So, I will admit that maybe I was being a bit excessive when I claimed that Vinny's rocket could make it to Duna and back. I built as close a facsimile as I could and I was only capable of a Duna "landing." To be fair, I'm not "great" at the game, and have not managed a successful Duna landing in general. But, that was my first attempt with this rocket, and I just kind of winged it a bit.
Maybe Ike is a more realistic option, I've never tried an Ike landing before, but I assume it has gravity similar to Minimus.
Video of my attempt.