Precisely what Tsub said. You want the boat to balance on that single axle just perfectly. Too far back and you won't have enough tongue weight....too far forward and not enough. I found this out on my first V20. Towed it with no motor down the interstate and she fish tailed like a mo fo b/c WAAAAY too much tongue weight without the engine back there to compensate. It might take a little bit of trial and error but its easy enough to adjust.