Comment by dlcarrier
1. Even though they aren't required to have OBDII, every electric vehicle has some kind of management interface, although manufacturers do often lock out users and third-party mechanics. Slate seems to show an interest in allowing third-part modifications and repairs, so I doubt that will be an issue. No matter what they do, I sure hope it doesn't require me to install their software on my phone or computer to access it, although I have no problem with them providing it.
2. Only very early first-gen electric cars, like the Nissan Leaf and Smart Fortwoo, were shipped without effective battery management. There's no reason any manufacturer would do that now, and I doubt any battery supplier would want to work with them, if they tried.
3. The Slate truck will be more capable. It has 201 hp and 195 lb-ft of torque, significantly outperforming the 117 hp and 149 lb-ft of torque in the standard-model 1998 Ranger. How they quantify hauling and towing capacity may have changed since the 90's, but you can rest assured that it is more powerful.
4. Designing an optional bench seat would be easy, but getting approval to sell them would be expensive, due to current safety regulations. This could likely only happen once sales volume is large enough to justify the long approval process for that variation.
Number four is likely the only holdup. If the SUV accessories are easy to install, it may still be worth considering, but I wouldn't be surprised if it's a long process for their first generation. Most auto manufacturers can't design an easy-to-install hard-top, on their first try.