Whenever I have a choice & know I want my doors ro stay open, I simpy back up the hill. I was at the car wash, went to vacuum out the jeep. It was on a slope & the doors wouldn't stay open, I had to turn the jeep around.
I think the bungee chord idea it great. Anything you wedge in near your hinges is going to stress them.
My doors are off 6 mos out of the year, so not a big deal.