The Ford 4.2 will def be better than your Nissan. I had a Colorado 2.9 that towed ok, but the 4.3 Chevy is noticeably better. I test drove a F-150 4.2 back in 2006 and it had decent power. I have a Chevy 4.3 and it tows my 3,000# boat fine. Of course a V-8 will tow better, but you're not towing really heavy loads. I wouldn't hesitate to get a 4.2 V-6, as you can get one cheaper than a truck with the V-8.
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