What about under the fridge? Or, what about behind the cover on the outside of the fridge? Or behind the cover on the outside of the water heater? There's usually enough room in both those places for the controller. What about in a storage compartment hidden behind the entertainment center? Mine is in a compartment. It's about the size of a cigar box.
'03 Freightliner FL112, 295" wheel base, with '03 United Specialties 26' living quarters, single screw, Cat C12 430 h/p 1650 torque, Eaton 10speed , 3.42 rear axle ratio