Steve, good to see you on this board. Yes there are a few hundred thousand morons on pirate, but there is some good tech over there too.
How is your truck coming along? Did not know you were coming to the GA Rally with cool parts or I would have come
Brembo makes a 405mm rotor (16") if that helps any, but you may not want to pay the bill on it...
Also an Isuzu FTR had disc front brakes for a few years and they are 11.25" semi ten lug hubs, talk to Doug Busbee about it if you want, I was just in his yard and there are tons of them there.
I realise that drums have more surface area, especially large commercial truck drums, just never liked the tech behind them and they suck in an off road application. Surely modern technology can make a disc and caliper(s) perform in a similar manner.
EDIT: found this link looking around for 5 tons with discs, he doesnt say what rotor was used but it looks kind of small. Very nice fabwork though:
Bobbed Deuce on 5 tons w/ disc brakes - TGW 4x4 Trucks Classifieds, Events, Information, Mega Mud Bogging, Muddin, Off Road, Offroad Racing, Truck For Sale, Truck Trader, Trucks Gone Wild
Cheers