I've had good success with raising ours in the chicken tractor with turkeys.
My tractor is 4'x12' on skids made from carport parts.
It follows the llama and alpaca herd and is pulled over the poop piles to rack out and eat bugs. I can move it within a single pasture if I'm doing a renovation followed by seeding, but it usually ends up having a run in each of the pastures during the season.
I usually raise 15-20 meat birds with 3-4 turkeys in this space.
Once they are past brooding, they are allowed outside the tractor during the day and locked up back at night. I give use free choice feed during brooding along with the patch of ground they are on with some waste hay or straw. After brooding, they forage during the day and are go back in at the end of the day with some feed tossed in trays.
The tractor moves every few days from one spot. I try to target mossy spots and poop piles with the tractor within a pasture area. They then go to the next pasture a month or so later and do the same rotation through that area.
I do reduce feed quite a bit when they are fully foraging. This has worked out well. A general rule I use is examining their crop. If I can observe them during the day, before feeding time (to get them into the tractor) I can get a sense of their ability to forage. I look for a bulge you can see when standing near them. If you can grab them in the tractor you can also feel how full their crop is as well. I found it good indication that they were getting enough. As they are growing I give them enough feed to make their crops slightly bulge at the end of the night once they've receive some feed. With great forage, there is little need for a lot of feed. By learning to ration feed to the birds as they need it, I have noticed the birds are healthier and also have less fat accumulation.
I start my run in Mid-May and then begin to process chickens in Sept-Oct, 2-3 at a time, 1-2 times a week. By the end the turkeys are the only ones left. They stay rotating in the pastures until I pull the herd off for the season. I usually then move the tractor up to the front "sacrifice" winter paddocks, with the herd near the barn, and use a deep bedding approach for the rest of the turkey run. I harvest turkeys starting in November and finish in December as needed for holiday meals with the remaining ones used for ground turkey. In the spring I move the tractor back out to pasture to prepare for the next run and rake the bedding into the paddock to become a garden paddock (this year we are trying wheat and onions).
We also have a fixed coop for 26 egg layers and they free range. We do have to fence them out of the garden paddocks once we start planting them, but some 5' fencing does the trick. For certain portions where we are germinating in the Spring, the flock stays cooped up for a few weeks and is brought extra greens and a tray of compost with worms and bugs to scratch through. The floor of the coop is fencing with catch trays that slide out to be emptied every 2-3 months.