ffryebird, I have a 2006 Ford towing guide brochure.....picked it up when I bought my 2006 F150.
According to the brochure, both the 4x2 and 4x4s only come with the 5.4L engine and automatic transmission.
If you have a 4x2, with a 3.31 axle ratio, the GCWR is 11,800 lbs., with a maximum loaded trailer weight of 6000 lbs.
If you have a 4x2 with the 3.73 gears and the heavy duty trailer towing package, the GCWR is 14,500 lbs, with a maximum loaded trailer wieght of 8900 lbs.
If you have the 4x4 without the heavy duty trailer towing package, then that has a 3.73 axle ratio with a 11,900 GCWR, and a maximum loaded trailer weight of 6,000 lbs.
If you have the 4x4 with the heavy duty trailer towing package, that also has a 3.73 axle ratio, but with a 14,500 lb. GCWR, with a 8600 maximum loaded trailer weight.
With 900 lbs. of people, and some gear added to the Expy, your main concern might be the GVWR of the Expy. I am near the maximum of my F150 with an 800 lb. tongue weight (non-TM), 400 lbs of people and dog, canoe, bikes, genny, and other stuff loaded in the bed, even though the stats say I have plenty of towing leeway.
Definitely get a WDH, you will have a much more towing experience. And that will lessen the load on your Expy by putting a 100 lbs. or so of the tongue weight back on the TM axle. If you can keep the GVWR of the Expy within stats, you should be great to go.
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