FB, I here that I see WAY TOO MANY just like that, squating from the weight. I hate driving behind them, thinking the next bump is going to be the end of that thing. I don't know of how to build a wheel system, but I'm sure someone here can help you out.
Even eminent chartered accountants are known, in their capacity as fishermen, blissfully to ignore differences between seven and ten inches, half a pound and two pounds, three fish and a dozen fish. ~ William Sherwood Fox, Silken Lines and Silver Hooks, 1954