From what I understand the Monster Truck tires are actually an Agricultural tire built for D-12 Caterpillar tractors. The primary two manufactures are Goodyear and Firestone. I don't think Toyo manufactures any agricultural tires. I believe their market is passenger and commercial tires.
Geared up to lead the global market through innovative technologies and brand development
TOYO TIRES handles a wide spectrum of products, ranging from passenger car tires, tires for commercial vehicles, trucks, buses, industrial vehicles, to tires for heavy construction machinery and studless snow tires. In each of the three aspects of the tire business, namely, sales to motor vehicle manufacturers, replacement tire sales for the Japanese market, and overseas operations, we respond to changes in market demands with innovative products and services that enhance safety, satisfaction, comfort, and convenience for our customers.
I also know Toyo sponsored a collegiate competition Hybrid Electric Vehicle for Chico State while I was there in the late '80's and they developed a low rolling resistance tire especially for that car; something that no other competitor had access to.
Either Goodyears or Firestones. Robby should plop down the dough and buy his tires from Sudden Impact racing. They manufacture "purpose built" monster truck racing tires. The typical Goodyear / Firestone 66" terra tires weigh almost 1000 lbs a piece. Most teams shave up to 300 lbs of rubber off each tire. The SIR tires already come lighter and racing grooved ready.
The Sudden Impact Racing tires are the future of the sport, and already available. As mentioned, they weigh 438 from the shop, where you need to spend upwards of 40 hours to shave a Goodyear or Firestone tread.
As far as Toyo, simply using a stencil on the sidewalls will give those tires a "white-letter" look. General did the same thing last year with a set of tires.