Have the fish purged for acouple days... Big cooler or bin with good water and lots of air and you'll be fine! Take some extra water for the ride back cause water will spill out lol. Get a AC convertor for the car jack and run a normal air pump... You'll have plenty of air then.
Was trying to get funds together for a pair of rays, IF I was able to sell most of the stuff in this thread it would be a possibility. There was only interest in 3 fish so all are staying and the rays will remain a pipe dream.