Apparently the 2005 Sport Trac came in three different wheelbases - 101.7 for the two door version, 111.5 for the 4-door version, and 125.9 for the Crew Cab version. So that is some of the confusion, since we don't know which you haved, archy.
More confusion comes from the assertion in the original post that the truck in question is 2wd as well as 4 wd. That makes about 220 pounds of difference in towing capacity, which isn't crippling, but it is some. Either way, it appears to be in the area of 5000 pounds "when properly equipped". As Ray has pointed out, this puts it in the realm of the possible, but not generous, for the towing you have in mind.
I haven't yet found out what "properly equipped" means, except that it MUST have a WDH. One reference says it must have a "factory towing package" to reach this capacity, but doesn't define what is in the package.
The Ford web site is hard to navigate, but is often quite helpful with this stuff. In this case, it is a nearly ocmplete washout. I'll keep looking.
Bill
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