I tow a Bobcat S185 on a 20' trailer (a combined weight of about 8,000 lbs) behind mine from time to time and getting it positioned just so versus the trailer axles is crittical. Too far forward on the trailer and too much weight is on the truck. Too far back and it sways and bounces terribly. The bulk of the mass should be centered as close as possible over the trailer axles. I prefer an ever so slight bias towards a little more tongue weight just to keep the rattle and bounce at the hitch to a minimum.
The trailer should also be as level as possible. For my Pequea bobcat trailer that means a 6" drop on the hitch. When using this same 6" drop with my Jetski trailer it's a little too high and the skis are canted ass-down (which actually works out great getting them on and off at the ramp). But get a drop that puts you as level as possible and when loading it try to center it's mass as close over the axle(s) as possible. I don't know what adjustment if any your trailer allows but on my jetski trailers I can move the winch/bow stop to adjust where the weight is carried on the trailer.
FWIW...
-John
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