I know the 20" won't fit under the cargo floor, that be a temp solution just thrown in the back, on upcoming road trip to NC. Right now I've got nothing...

I'm hoping like hell that 18x8.5 fit under the cargo floor for the semi long term solution. If not maybe an 18x8. It does seem like the 17x7.5 just fits though.

And I do want the compact spare, but for $1500, the $200 18x8.5 is looking like the winner right provided it fits under the floor. Smoothly.

Reason I asked about using the 20" is sets can be had all day for $500+ and I'm planning on buying another set of 20" wheels anyway.