I'm pretty sure he mentioned his car is RWD not AWD, that's why it fit in the frunk. I have tried placing a 20 inch Model X rim (no tire) in the frunk of my 75D and it definitely does NOT fit.I acknowledge that this thread is old, but I happened upon it and so may others.
Thanks for this statement. Good to know that a deflated 19" tire and a pump should fit in the frunk and be a valuable addition to the road trip packing list.
QUESTION: Has anyone purchased a hitch mounted tire rack and carried a spare on the rack for road trips? It seems like a reasonable option...