I use a floating minnow bucket, and carry it to the lake in a 48 quart cooler with the bait shop water about half full in it. ( Make sure the bait shop attendant puts the minners in the floater. It's hell catching 10 dozen minners when you get to your spot and I've had that happen more than once while not paying attention). My cooler also has an aerator on it but I seldom use it unless I have a long ride. I throw the floater in the lake when I get to my fishing spot, and I never have problems with my minnows dying day or night, even in the summer. You can put the floater back in the cooler to move. I drag the floater as I go, and dip out a dozen or so to put in my regular minnow bucket to fish with. When you leave for home, you can put your fish in the cooler too. I don't use ice in the cooler, (but you could on a long haul) just the bait shop water. Might add some Better Bait. I don't, but I usually buy my bait close to where I fish.
I do save my minnows with my own oxygen and a plastic bag if I'm going back in a day or two. You can buy oxygen at any medical supply place and 20lb ice bags from any ice house. ( make sure the bags aren't perforated--holes in em ;-)
We only sell the Best. Ranger, Xpress, Yamaha, Suzuki, Tohatsu.