My preference is to wear the 3D ghille type suits that bass pro makes on the cheap. They also used to have this nice small folding chair with a shoulder strap. Take a few mouth calls and I'm good to go. Once you start bringing blinds, etc you have to take it all down to move.
As far as guns go I just use an old 870. Sit up against free and work my calls with the gun in both hands... With mouth calls you don't need a steady grip and can get into the action faster.