Freds,
I've been following the electric RV idea closely including conversations with high end coach manufacturers pushing them and learning from those that have been thinking of this problem for a while. The biggest challenge I've identified is the charging and range challenge. Certainly the tandem electric axel would not work directly for our coaches. And if you remove the engine/trans/fuel, then you're 100% dependent on electricity. Range is just a battery size problem? Not actually. The limiting factor is recharging infrastructure. It's easy to bolt on more batteries, but not easy to get them charged at your local RV park. If you examine the charging capacity of our typical RV park 50A pedestal, you'd find that you'd still be charging the next morning to get sufficient range. "Sufficient" is defined to be something typical of existing coaches which is comfortably 500+ miles. An electric coach with only 250 miles of range would be a complete market failure. Remember that your effective range is 60-70% of the theoretical range. Noone can run 100% of range, just not practical no matter your fuel type.

So while I'd be one of the first to buy an electric coach, the industry (and charging infrastructure) isn't quite there yet. I'm optimistic this will be solved in the near future. I wish DriveTandem luck in their endevour for the short haul trucking industry.