Replace 2021 "TSS" 20in wheel with Method - which one?

Hi,

I have a 2021 SR5 that came with the OEM black TSS wheels:
- 20" size
- 9" wide
- Offset +50 (per the web)

Planning on getting some Methods. Would like to drop down to an 18" size so I have more sidewall. I use the truck for daily driving plus some towing - will not do a lift nor add flares. Looking to keep the stock geometry all around.

Method has three wheels that I like in 18" size: 701, 316 and 308

But not sure what their "Offset/Spacing" spec means.
- 308 = 18/5.75"
- 316 = 18/5.75"
- 301 = +25/6"

Questions:
- Are the 18 and 25 the offset?
- Will those fit my truck without causing the tires to stick out? (Nor do I want them to be inward of the fender, the OEM wheels are pretty flush)
- What is the latter measurement provided in inches?

The whole issue of offset is confusing to me. To match the OEM look I would think I'd need aftermarket wheels also with offset of +50 but none of those are the same.

Thanks

 

1. Yes.
   
2. No.
   
3. +25 will poke roughly ~3/4" passed the fender.

You can use a tool like this to visualize the changes: