I've made 5 hours trips with a dozen LMB in the 9 to 12 inch size using a large cooler and a simple bubble aerator. The key is the outside temp...if you can find a window that's between 65 and 75 degrees you should be ok making long hauls. I frequently haul a pound of golden shiners in my Frabill 13 quart cooler 2 1/2 hours with the cooler in the cab of my truck during Summer...no deaths, but gets to smelling a little fishy with the aerator running...I'm pretty sure they would last overnight if needed.

3 1/2 hour trips with fish from Overtons Fish Farm packed with O2 in boxes always make it...but then again, I only transport in Spring & Fall when temps are desirable.