Hi Gypsy, I'm very excited about the RadRover electric bike. I rented one for a couple of hours last week and it was a BLAST to ride! I'm in my 60's and have body pain issues and just can't ride my road bike any more without paying dearly for it. The 4" fat tires and the front suspension on the RadRover were really kind to my body. I also rode the RadMini for a few blocks and the controls for that bike are the same as for the Rover. The ride is just a different "feel" with the smaller diameter tires. I'm going to go back and rent the Mini for a longer time to help me decide which one to buy.
My plan while riding was to pedal as much as I could and use the throttle when I needed it or wanted an extra boost, such as going up hills or getting through an intersection before the signal turned red. It turned out to be a perfect combination of exercising my muscles/lungs while getting to see a lot of scenery without worrying whether I had the energy and strength to get back to the bike shop. The "20-mile" range limit is a very conservative estimate. I rode close to 20 miles and the battery indicator when down only one notch (I think out of 4, if I remember right.)
Using the throttle sounded complicated when the guy was explaining how to use the bike, but it was pretty intuitive when I got started. You don't have to switch around on the components--you just pedal when you want and twist the throttle when you need an extra boost. Easy! And did I say fun?
I was on bike trails and streets, so I can't say how these tires would work in the desert, but the woman Bob interviewed made it sound like it worked well for her. I would encourage you to try one out if you can. I found the bike shop I used at
https://www.radpowerbikes.com/pages/where-to-ride
The price is right on the Rad bikes compared to other electric bikes. I also like the fact that you can get exercise if you want (vs. a scooter or motorcycle) and yet get assistance if you need it. The down side is the weight. There's no getting around the fact that you have to heft around 60 lbs. of bike (a little less if you remove the battery) when it's time to load it up into or onto your vehicle. If you can do that or know how to rig something to accomplish that, I'd say you're golden.
I'll be eager to hear if you get to try one out!