Predator aprons on tractors

[yyz0yyz0]

I'm currently raising my first batch of meat birds in a part of my existing chicken run. I'm sure by the end of this the run will be trashed and smelly from the meat birds. If I decide to raise meat birds again I'd like to use the tractor method but I'm concerned about digging predators. Within the first week of having my chicks in a secure run, I've found signs of diggers that hit the apron and stopped attempting to get in.

But what about tractors and diggers? I've thought about a wire floor in the tractor but that seems like it would limit the birds access to the ground/bugs/seeds etc etc.

What do regular tractor users do for aprons/diggers?

 

[Krugerrand]

@aart has one with a flip down apron:
https://www.backyardchickens.com/articles/aarts-hoop-coop-chicken-tractor.72211/