Dew, My prayers are with you & your sister. I am sure a positive attitude helps with this. I belive that to be true. You have gotten alot of great advice. I have travelled alone doing all the driving myself since getting RSD. ANd with family. I did 1200 miles in 3 days. It was very very hard. I also have a luxury car. I have a 1995 Cadillac. Rides like a dream. Still I needed the extra pilows like were suggested. I wear loose clothes. And I get the heck out of that car as often as I can or feel I need to,. Period. Otherwise its way worse. I have made the same trip for years & used to just shoot on through like a bolt of lightneing. Not anymore. Take your time & take care of yourself & it will pay for itself when you get there. Have a very safe trip.
Hugs, Denny