When I was driving an electric vehicle for a while, I did start thinking about a gas generator as a range extender.
My idea was to just fix up a small trailer with a small gas or diesel generator that generated, say half the power my pickup consumed.
So, say I had a range of about 50 miles. By using the 50% generator, I could likely push that 50 miles to 100 or so pretty easily. There would be less of a chance of getting stuck with a dead battery, and overnight, I could do a full recharge.
If you had a camping E-Bike. Then around town, just use the E-Bike. When you're ready for an overnight trip, grab the trailer and take off. Camp at the trailhead and fully charge. Then head out into the mountains, battery only. On your way out, camp at the trailhead again, recharge, then head home.
A small solar panel may also help.
Might as well also add an auxiliary battery and fuel tank to your range extender trailer.
Last edited by CliffordK; 08-02-18 at 07:32 PM.