I'm jumping in a little late on this one, but I definitely would go with the trailer. Since you don't have a truck, you can also use the trailer for things you can't haul in your van.
This is one of the issues that I've been wrestling with lately. When I buy my new car, I was thinking about keeping my Ranger for those few occasions when I need to haul things like lumber and mulch. I've already got a Ford van that I keep around for towing the tractors on the trailer, so counting my wife's car, I would be paying for license plates and insurance for five vehicles (two cars, truck, van, trailer). Now my current line of thinking when I get the new car is to get rid of the Ranger, and use the van and trailer combo more often.
But I digress...
The van/trailer combo seems to be the way to go, since you've alread got the FEL on one tractor. /forums/images/graemlins/smirk.gif