Close to 12 months ago I 6 boxed AO using 2 computers the classes were:
x1 NT, main dps, this account was upgraded to Shadowlands for the Cyberdeck item $5 per month
x1 Enforcer mongo and Essance buff for NT
x1 Fixer for the x2 HoT's for my NT, also team evac into the grid
x1 Doctor to heal
x1 Engi for Pet and to do full tradeskills to make my own weapons and armour
x1 Meta Phys for the Nano buffs

Boxing missions for tokens is pointless cause of the very poor pathing, all my leveling was done out doors mainly in the Lush Fields camps then moved onto Bot Hackers and 8x8 in pleasant medows etc. By the time I had left pleasent medows I had x2 Grid Armour discs drop for killing NPC camps this lets ya get Yalmaha's for all ya toons this fixes ya /follow command niggles cause they can fly so fast behind you. Prolly the most fun I had was flying around with my fixer finding good kite spots for the NT.

It is also worth taking ya enforcer and Doc into Temple of the Three Winds and getting ya Doc the Chalice that drops in there very nice healing item, anymore than duel boxing in there is to hard and a Doc / Enforcer combo can pretty much take down any boss.

I quit at level 80ish and went back to Vanguard.