Muddy, how many heavy duty trucks do you think get sold per year? If he's done 36 in 3 months, and he can keep it up for the rest of the year, then that's already a decent percentage of the market. Production rate will obviously increase as they get the lines running properly as well - the first quarter of production is always the slowest, for anything.
To compare - in a given year, Mack will typically sell about 125-175 trucks per quarter in Oz.