Loading the rear of the tow vehicle down one inch is almost PERFECT.... the "tongue" should have 10% of the load on it. So 6,000 pound load should have 600 pounds of weight on the tongue of the trailer.  
 
 
If the trailer doesn't sway --- and some do! --- and the front of the tow vehicle isn't getting "light" and becoming a "too much steering input" issue.... Then I'd say you've got no problems. 
 
 
NOTE: Too LITTLE air pressure is the biggest cause of tire failure -- so when towing ALWAYS fill your tires with the proper air for TOWING..... A stiffer sidewall (more air pressure) will also help with trailer handling. I actually adjust my tire pressures depending on the season -- I use more pressure in the winter than in the summer... because the HEAT of the roads etc changes the "running" pressures. I run 105 pounds in the front in the summer and 110 in the winter on "the rig".
		 
		
		
		
		
		
		
		
		
	
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