Thanks, I made a post at Radpower's Facebook page.
I have yet to try it, but I had the thought that if the bike has a good kickstand, then I might be able to put my right hand on the seat, then grab my right knee or shin with my left hand, to help lift my right leg over the main tube. I think I could get over a tube 18" in height.
It looks like that little tube on the Big Cat is about 14 or 15" above the ground. I'll email them and ask. And I'll ask somebody at the Sondors Facebook group about the Fold X's main tube height, and lowest seat height.
Yeah, I'm definitely going to try before buying. I did ride my roommate's cheap Chinese scooter the other day though. It was more nerve-wracking than I would have liked, but it was wonky, wouldn't start properly, and had what seemed like really bad torque. That coupled with the fact that the Fold X is 50 pounds makes me feel like being able to ride an e-bike is promising. Regardless, I should be able to try at least the Rad Mini soon.
I forgot to mention, I'm considering buying an RV like a class B camper van. So for that reason, I think it would be better if I could store the bike inside the RV. A folder should make that a lot easier.