Hunter is by far the best leveling class to dualbox with RAF and no gold. I had two on new realm and you don't need any equip really and even can buy just few spells. I'd visisted trainer just four times in levels 12, 20 (Orgrimmar) and 33, 44(Grom Gol). Just activate attack on assist in combat menu and spam macro on slave:

/follow Main
/assist Main
/petattack
/cast hunter's mark