Upgrade stock spare tire/wheel options

I've researched all afternoon and can't seem to find the answer I'm looking for.

2018 TRD OR..... Truck is setting on Method wheels with 285/70/17 Ridge Grapplers. I'd like to have a capable spare tire. Currently the stock 16" steel wheel with the stock wrangler is under there.

I don't plan to for 5 wheel rotations and I don't really want to by a 5th Method wheel....

Current tires are E load and I'll likely go down to C load when I wear these out.

Buy a 16" tire that works out to the same height as the 285/70's? If so, what size would that be? Or....... a cheap 17" wheel?

Links?

I've exhausted my searching abilities!

 

Just buy a 5th setup of your same wheel and tire .Youll never have to stress about it again If you ever damage a wheel you got an extra. Buy once cry once