personally I would use a cooler and and air pump with a car adapter.........a large garbage bag to grab it and definately use some of the water in its current tank.........
I haven't pulled it out to measure though I am sure at least 23 maybe close to 25" I have had this fish for a while hold up i will check my threads for an exact date.
I don't guess... I use a tape maesure so i don't lie to you
I transported a 16"-17" Jardini (not nearly as big as 2ft), but i putted the fish in a trash bag, and then placed the arowana in a styrofoam box. I didn't even used a battery operated air pump. All the movement from the car ride should provide it with enough oxygen but to be safe bring one along. My trip was around 2 hours so any of the methods listed above should be A-OKAY!