Courtney, I'm not 100% positive, but I think fantastic fan uses the same housing for both the low and high profile; they just turn them upside down during the assembly process. Obviously, the low profile extends slightly less above the roof.
If you have difficulty rolling the trailer (I understand, I used to store an Aliner in my garage, slightly uphill and a raised edge to keep rain from running in), you might want to consider a portable winch from Amazon. Put an I-bolt into the concrete near the back wall centered where you park the trailer. Hook to the I -bolt and hook the cable around the trailer's bumper, and press the button. The winch will pull the trailer slowly into the garage for you and all you have to do is make sure it doesn't contact anything going in. You can even use the I-bolt during extraction to ensure the trailer doesn't "get away" from you when it hits the downslope. Portable winches will run you somewhere between $100 and $200. PM me if you want more detailed information.
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