Because it's broken & rusted out it has a couple of holes, so we didn't add any more holes or anything. We removed the plug it comes with as well. There is a 2" layer of rocks found around the yard so that the holes don't get too compacted. After that.. we layerd in, sand, clay, top soil, compost, and some woodchips and repeated until full (not necessarily in that order). So yep... I USUALLY cheat on these sorts of things, and only half fill them, but honestly it was totally worth it.
I suspect if you fertilize & be festidiously clean about any dropped fruits & veg, picking out any bugs, you can grow in that driveway bed year after year without rotation. But a few big pots wouldn't hurt too.
I grow lettuce here all the time, for the space, I prefer baby spinach, more nutrients just as good and grows very well. Picking in 50 days from seed is also a really nice bonus for me. Both seem though to grow well just about anywhere. Lettuce gets bitter when it starts to bolt or flower, just taste a leaf before you pick to tell. I can't imagine that it could grow too fast or anything... you should give it a try and take notes or good photos of the experiences to look back on next year at this time.
Have you visited your local Agriculture department and getting some guidance? They certainly know your area & it's conditions well. Here we can get a soil test and they will let us know what we need to add to make everything "just right"... although I've never actually done this myself, I'm more of a trial and error gal I guess... doesnt' make sense really, I should do it the easy way and just get the test!