I agree you will be fine with a 6.  I used to tow a 20' formula with a 4.0 litre Ford Explorer.  I thought I needed a little more oomph and a little newer vehicle, so I traded the Explorer for a Mercury Mountaineer (Mercury version of Explorer) with a 5.0 litre V8.  The V6 4.0 really did just as well.  I now tow with a Suburban, and it is a beast.  I towed my V20 Cuddy with the mountaineer, and it did ok power wise, but the V pushed it around on the highway.  For your short distance, you should be just fine with a 6.  You won't be doing any holeshots, but you shouldn't be driving hard when towing anyway.
		 
		
		
		
		
		
		
		
		
	
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