2010 Sierra Scotty HiLander

thanks guys, def some useful...and not so useful advice here.  The 4k above refers to the towing capacity of the trucks i was looking at, not the weight of the trailer, apologies on the confusion, my bad.  since my question was specifically about the air resistance, not the weight, i didn't include the weight specs, i have included them below.  Not sure how someone would come to the conclusion that i have no towing experience.  I would give my self a solid, high level beginner, low level intermediate towing.  Done a bunch with U-hauls, utility trailers, etc... over long distances. 

• Approx. Dry Weight .....2590 lbs.
• GVWR ..........................3500 lbs
• Approx. Tongue Wgt ....280 lbs.

The reason i asked the question the way i did was that i am looking at a Ford Maverick Hybrid, with the towing package which says it can pull up to 4k lbs and has an 8000lb total load limit, however there is a trailer front side square footage restriction of 40 sqr ft.  I realize that trailers are like pulling a parachute behind you, but i also know that a lot of that depends on tung length (which is pretty short on the HiLander, i think like 4 ft), and how the turbulence off the back of the vehicle passes on the the front of the trailer, and the shape of the trailer. Some users on other forums have said that the 40sqr ft should actually be thought about as space that is in excess of the shadow of the vehicle.  So a truck with a cap is going to have a different air resistance that an truck without a cap, vs a hatchback vs a car.  Not sure that i buy that entirely, but it is a thing to consider.  I am trying to understand this square footage restriction better to see if this hybrid truck can pull my trailer. 

The people on the Maverick forums seem to think its fine in general, especially if you watch your speed.  Obviously, elevation, climb, and temp matter and you wouldn't use a hitch that wasn't rated for your weight. But, towing capacity being >1K over the dry weight (or lets just call, it packed weight at 3k).  I know ppl tend to be suspicious of the hybrids, but the community seems to be happy with the Mavericks in general, and the non towing gas mileage is great.  so trying to see if it makes sense.  I am looking for something that get decent mpg when not towing, but can still handle a decent load.