This is one idea I have for making room in the garage, living room, cave, or wherever you need to get more kettles in the room, but dont have any floor space.
I used some of those cheap metal shelf brackets to support the axle. They were cut to length then I used a 3/8" file to make the groove for the axle.
On the top side I used some pipe straps that are used to hold your pluming under the house or whatever. All the weight of the grill is on the axle and the strap on the handle only keeps the grill upright.
Iv got a few mounted in my outdoor food processing area/garage.