filled with soil top the very top, loosely packed. You could get two 3 gallon bags filled with some room to spare. I like to fill mine 2-3 inches down from the top. There are all different sizes, but for easy portability 7 gallon and below are easily moved. There are numerous vendors of the bags I choose to use the AC Infinity line, while not the cheapest in dollars the quality is a great trade off. I have reused the bags for a few grows. They last.
It’s been a little while since I’ve made ‘new’ soil I’ll find my formula and post it a little later. That’s for using in bags. It got great aeration. I reuse the soil from the bags over and over, too many good things in there to start completely over again… I regenerate the soil in between grows.
https://acinfinity.com/fabric-pots/
For containment of the soil why not use the bed of one of the pickups. 
Straw bales are great. I’m reusing mine again this year. Had to rebale one but they’re good to go already. The warm streak we had allowed me to get them ready early. They do have a tendency to break down which gives me an immediate idea. If you do have an old water trough instead of filling it with soil put the bale in it. Don’t break down the bale just use the trough to hold the bale in place. You’ll need drainage through the bottom but you would’ve need that anyway. It would have to fit though.
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