Jesse Good Biological Isolation Works Great No Matter What Speces Are Involved. Basically Build Your Routine So You Start With Gamebirds 1st And Work Through The Rest Of Your Birds... Youngest To Oldest And Cleanest To Dirtiest. So Start With Your Quail Brooders, Then Quail Grow Outs, Then Adult Quail, Turkeys If You Have Them, Then Waterfowl, Then Chickens And Guineas... In That Order. If In Ground Pens Think Of Ways Not To Track Dirt From Other Pens Into Them (such As A Shoe Change With Dedicated Shoes For Specific Speces) Nobody Comes In Direct Contact, Or Close Casual Contact With Anyone Else Not Of Their Speces. Frequent And Strict Handwashing Helps Also.
As For Your Chicken Tractor... It Can Be Sanitized Without Much Problems, Just Know That Tractors Are Awful Easy For Predators To Defeat, And Quail Will Attract Every Would Be Predator From 3 Counties In Any Direction... So Look Hard At That Tractor And Think Is It Bomb Proof? And If Not What Needs To Happen To It To Make It Bomb Proof( Total Wrap Of 1/2 In Hardware Cloth Is The Best Place To Start... Latches On Any And All Openings That Cannot Be Readily Opened By Coons, Also Think Of Openings--- You Need To Be Able To Reach All Areas Of The Tractor Easily Through Them So More May Be Necessary, And Ideally They Open With A Hinge On The Side As Gamebrds Spook And Flush Easily And It's Quite Simple For Them To Fly Out Of An Open Doorway, Redundant Door Ways Help).... You Cannot Over-protect Quail When It Comes To Predation