Interesting points raised so far.
Let me clarify a bit: I doubt the Mrs. will be towing the tractor with the Pacifica, but more like general utility trailer use. The tandem axle H&H is around 1250 lbs, leaving 2250 lbs of load. Any soil/mulch/sand/tractor duties are mine with the Expedition, 6900 lb towing capacity.
Yes, I agree tandem is better for all the sited reasons. I was strongly leaning that way before starting to look, so this only confirms what I thought. Tandem axle it is.
RayH: Tell me more about Prodigy brake controllers. You mean I don't have to have a hard wired permanently mounted ugly knee whacking box sticking under the dash? How do these get wired? You mean wires from the electrical connector get run under the car, or inside the car? How does the Prodigy controller mount to be removable? It's not so much the cost but more the hassle factor, and the ugly/knee whacking/drilling holes in the new car reasons I was wanting surge brakes.
MrJimi, or should I say rebbe

? I hear you about stuff filling the space available. I'll be able to store the trailer in my garage for a while, but eventually vehicles will need the spot, so the trailer will get stored outside under a tarp. I'm trying to find the smallest I can get away with for storage reasons, but I understand bigger is better.
To all: $1200-1500 for a tandex axle trailer? "They are around $1,500 here in Florida and they should be about the same at you end of the world" MY QUOTE IS FOR Can$4395.00!!!!!!!!!! This is for both a 5x14 or 8x14 tandem axle 7000lb surge braked trailer, plus $200 for a split ramp gate and $75 for teardrop fenders. We have 13% sales tax here (7% provincial and now 6% federal sales taxes), so my total cost for this would be $5277.10!!!! The dealer is also a rural Ford dealer, and says he sells about 7 trailers a week! The Canadian dollar is around 90cents US, so Can$5277.10=US$4749. How the heck do you get them for so cheap?