Jim,
Welcome to the joys of Ferreting. I use an old pair of army ear defenders when driving solo, but pop off the plastic covers and put in an extra layer of foam cut from anything and this works a treat. If using intercom head sets with a commander, then the bigger the better rather than old style thin ones and make sure they are seated well on the ears.
Also, get yourself a wing mirror on a handle to poke out of the side hatch so you can see when pulling out of junctions.
Cheers
Dave