1) How many acres of solar panels will be required to cover the power demand of a MegaCharger? Assuming the Tesla Semi gets 10 MPGe and the MegaCharger replaces 400 miles of consumption in 30 minutes, that means you need the energy equivalent of 40 gallons of diesel fuel every 30 minutes, or 80 gallons equivalent per hour.
At 139,000 BTUs per gallon of diesel, and 3912 BTUs per KwH , that's 35.5 Kw per MegaCharger slot. X3 if you want to recover 24 hours worth of charging, not just daytime charging. That's a bunch of solar panels.
2) So far electric vehicles are getting a free ride on road taxes collected at the pump. I'm sure that will end soon, especially now that electricity will be powering large, road pounding vehicles. Let's see Tesla cover those costs at the promised 7 cents per KWh.
This got me curious so I went to RVMobileinternet and checked it out closer. Should be what you're looking for. The current version isn't perfect though, based on their review. There is a new version coming out soon that may address the issues with the current one.
I just priced a 2018 chevy LT (mid trim level) dually at Classic in Dallas, $53k ($57k out the door). I was looking a 15 model w/120000k miles for $39k on CL. For $14k before tax, the difference doesn't pay to get a used truck.
When I talked to a former local MIch dealer this summer, sales person said I could not take delivery of the vehicle at his dealership until the TX plate and registration was received, meaning I couldn't get a Mich temp plate now that I was a TX resident. I figured he didn't know what he was talking about, but his price was also $57 out the door for a 17 model.