I just looked up the MMOF and the starting price is $8200? That's a wad of cash for a backyard cooker. If you really want an offset stickburner on a trailer, I'd look at the Jambo Baby J or call R&O smokers and see what they can make that is equivalent. Jambo is in Burleson I think and R&O is in Granbury. Both are closer to you than any of the other options.
Check out the trailer smoker MUSCRAT just built. It looks very similar to a Jambo and Muscrat said he would like to build some more and sell them. He could make you whatever you wanted I'm sure and he's in Abilene.
JAMBO Backyard - Large BGE - 18.5" WSM - UDS - Weber Performer