Remember for your road trip this weekend: You need to start at 95-100% to be comfortable and drive as fast as you want, and the charging can be quite slow at the end (due to rebalancing, etc.) It's possible you won't notice this additional slowness with the 120V/12A charging, or you may notice it even more if there are considerable extra energy requirements to accomplish the rebalancing (I haven't analyzed this at all).
The key thing is that it's going to take quite some time to get to 100%, so you need to be prepared for this with your 120V range charging prior to your trip to Reno. Don't assume you'll get the same mi/hr rate in the 95-100% range of charge; give yourself lots of time margin.
Also keep in mind you won't have any significant regen for a while if you start at 100% charge. You'll probably be back to full regen when you get to around 90% charge with everything warmed up (but it depends on the temperature).