Moving fast and effectively across states?

I have a total of 3 days to pack my stuff out of my townhouse and clean it for the next tenant. Driving my carload of stuff and 3 children age ranges 7-2 in a smaller vehicle. I worked up until I only had 3 solid days to do this because I need the money. I am a single mom of three. I wanted to rent a truck but could not afford it. Any advice on how to move everything out very fast and effeciently and make things fit into a scion TC? I will mostly donate lots to charity as my family is helping me gather furniture so I am thinking clothing and bedding is utmost important but I don't want the kids to feel I am being mean by leaving some toys behind for less fortunate children. Also with the kids running around how will I be able to get packed? I am so anxious about it all. ANY ADVICE would be very much APPRECIATED!? BTW, I am moving from Pennsylvania to Texas.