It reminds me of an old saying in BMW motorcycle circles that "the cheapest part on a BMW motorcycle is the rider". I guess that could extend to other products and brands as well. The hay is always cheaper once it has been run through the horse.
Looks like your wheels are set narrow, so you could always flip them for a wider stance if your brush hog would still cover it. If not, you could run the brush hog of-center so that one side covered.