Possible to mount a TRD BBS wheel as a spare under my bed?

As of now i only have the shitty stock spare. I was thinking about trying to pick up a single rim (18in) and a 5th tire when i get a new set in the next few months.

Is it even possible/feasible? i feel like i would need to get a different chain mount, and am a little worried the tire/rim would get the hell beat of it /even fit, its sitting on 2.5 kings.

 

Will i need a different chain mount? O feel like looking at BBS rims, that mount is not going to fit

 

The spare tire fits with the bracket/brace against the unfinished side of the wheel. The good side is facing up.

No reason it shouldn't fit. I have a full sized Black Rhino in mine with no modifications and no damage to it.