"Barry Bean" : : 2) Extend the ball mount a few inches past the receiver. This would be : ideal, but would obviously increase the leverage on the receiver. FWIW, : most of the trailers I pull have fairly light tongue weights (usually a BBQ : grill with a 50-60 lb tongue weight and 200-300 lbs total weight). : Obviously I couldn't use this on a heavier trailer, or one that approached : the vehicle/receiver weight limit.
This is probably the way to go but also be aware that by extending the distance from the rear axle to the ball will effect the handling. While going down the highway, steering corrections will be magnified through the tail swing of the Liberty.
You're probably going to be absolutely fine and I don't want to sound like I'm blowing this out of proportion... but...
To correct for this, if you extend the tongue 2" you should move your axle on the trailer back 2"... which further increases tongue weight.
The optimal setup for towing is to have the ball as close to the rear axle as possible and the axle of the trailer as far back as possible while not exceeding your tongue weight.
This is why tractor trailers use a fifth wheel, to keep the pivot at or ahead of the axle. Anyone that pulls a fifth wheel camper trailer on a pick up truck will tell you they would never go back to a hitch and ball set up because it handles so well.
When I bought a boat without a motor several years ago I towed it home behind my Suburban and the trailer tracked great... I made a point of 'testing it'... 70-80 mph without so much as a wiggle. When I rebuilt the boat and hung a 6 cyl Merc outboard off the back, it handled terrible. I slid the axle back two holes, levelled the trailer and balanced the tongue with a piece of wood on a bathroom scale. Close, but not enough. Moved back two more holes, balanced it again and just shy of 300 lbs at the tongue. I should have gone a bit more because when I filled the boat with gas, it lightened up a bit but it was light years better than it was.
Okay, now I'm just rambling... hope this helps.
-Brian