Sometimes i run:
5 nobz [1pk, 1bp, 1ha when have pts] + Painboy [Grot orderly] in a truck or wagon.
They act as a retinue to Megaboss and are doing quite good. Nice ranged durability cause of
fnp, some awesome protection vs gravgunz

, pack a bosspole on their own, I think that with a megaboss, even 2-3 and painboy wouldn't be worse than meganobz. 2+ with
fnp is statistically not much better than plain 2+ but annoyz the opponent alot
Anywayz, their best use is to be placed on a bike. Still if you wana use regular nobz - try out this 4-5 nobz+painboy + megaboss build. Not outstanding but work quite good.