Roving hordes of warlord-run gangs aren't likely to last all that long. Unless they're extremely successful, they're going to be constantly infighting for resources, and success is a very high bar, because if they don't win every conflict, their population will rapidly decline from attrition.

It won't take long for it to become overtly apparent to the members of roving hordes of warlord-run gangs that befriending an off-grid self-sufficient abode is a much, much lower risk option than raiding it.