For flat towing a hybrid, take a look at a Ford C-Max. It's one of the easier vehicles to make ready for towing, and earlier models (2013-14 ish) are relatively affordable. Sometimes the "Energi" models, which is the plug-in version, go for even less than the regular models.
I had a relatively lightweight dolly for a while, and it was still very cumbersome, and hard to move on anything but flat pavement. Plus putting the safety chains on the lower control arms was not very pleasant in the rain, since it pretty much required laying on the ground for my car.
