The Evolve Trikes look interesting. The folding process is remarkable. From the video, it looks like they have 16" wheels, which will reduce the folded volume but also negatively affect the ride. My ICE Sprint folds the rear wheel up and 90 degrees so it lays on the cruciform joint. The seat has to be removed first, which is not a big issue, but you then have to put it somewhere. I was able to stow it in the trunk of a Toyota Camry with not much effort. Mine has rear suspension. I think it is a good thing, but I have not had a chance to ride a trike without.

Again, I think testing a few trikes is the best idea, even if you have to drive a few hundred miles.