Here's mine, fits my 4x us2200's perfectly, and the best part is, it was cheap, got it from harbor freight.
I had to cut the propane tray and slide it up pretty far, i also intend to cut the handle off the tongue jack and weld on a lug nut, so i can use my cordless impact wrench as a power tongue lift as sorts, or i can use a normal socket/ratchet as a manual way if needed. That way i can still put on the plactic propane tank cover and then put a hole in it so i can get to the tongue jack without removing the cover. (been considering a soft cover, but i'd rather one with dual zipper so i can just open it where needed for the tongue jack, just been unable to find one, i suppose a soft cover may allow me to keep the tongue jack outside of the cover entirely, which i suppose would work as well.
It will effect the jackknife point a bit, but really if it's pivoted that far, it's probably past saving anyway :)