Meanwhile, back at the ranch, building ATVs to endure the stress of utility use put Honda RandD on a steep learning curve. Approaching the mid '80s, ATVs were inspected, dissected and exhaustively scrutinized with more data acquisition equipment than any other Honda product. Machines were run hour after hour, day after day for weeks, with riders wearing 50 pound instrument packs that recorded information on every aspect of the machine's operation. As the market's swing toward utility continued, Honda's research made it clear that the next step in the ATV's evolution would be another wheel. Thus Honda's first four wheel ATV, the TRX200, debuted in 1984. The market responded almost immediately, making 1984 Honda's biggest sales year for ATVs. The 370,000 units delivered in 1984 remain the high water mark for Honda ATV sales, making up a full 69 percent of total ATV sales in the U. S. that year. The upswing in utility use and the introduction of the four wheel TRX200 were also the beginning of the end for Takeuchi's three wheel matrix. Four wheelers were considered more versatile tools by customers, and tools were what people wanted most.