Thank you all for offering great advice!
First:I found a parking location which has granted me permission to plug in at night; I purchased a small Pelonis fan-forced heater unit (it has a thermostat to control temp) This is my first night with it and this is exactly what I needed! I does not produce HOT forced air - I can control the temp and the lowest setting works well (window is cracked to allow cord run out and into plug.
Second:I lined the floor of my SUV with closed foam camper mats from Wal Mart;
I bought heater socks! THE BEST!!; Fleece PJ's, hat and aloe gloves (eh, I figured if I'm going to wear gloves for warmth, I'd buy these for the added benefit for my dry winter hands).
I'm feeling GREAT!