Wheel offset vs. Spacers vs wheel swap

I have a set of 17 inch wheels off of an older FJ Cruiser that I just installed in my 2016 Tacoma TRD off-road. The TRD off-road came with 16 inch alloy wheels and as I understand at the offset on these stock wheels was something like 25 to 30 degrees. As I also understand it the standard FJ Cruiser wheels which are 17 inch had an offset of 15 degrees stock. Not understanding fully this offset issue and so forth my question is I'm running a 1 inch taller Tire and since there is a difference and offset can I make up this Difference by using wheel spacers or does the offset actually space out my wheels more anyway? I have them mounted on the truck now and don't seem to have any issues with rubbing or anything what are your thoughts

 

http://www.tsw.com/explore/what-is-wheel-offset.php

 

So if I have a wheel with a 15 offset and I want to make it the equivalent of a wheel with a 30 offset I would need to space it out with wheel spacers I just don't know how thick of a wheel spacer to get it to be a 30 from its current 15. The video talked about millimeters shaving millimeters most wheel spacers come in one to two inch it seems like a lot more than is needed but I'm not sure

 

http://www.rapidtables.com/convert/length/mm-to-inch.htm

 

The closer the number is to 0 and negative (-) offsets, the more the wheel will stick out. If you have a +30 Offset wheel, and would like to accomplish a +15 look; then you would use wheel spacers.

If you have a +15 wheel and want the +30 look (more inside the wheel well or flush with the fender) you would need to get new wheels.

Wheel spacers push the wheel out more, not bring thee wheel in towards the vehicle.

Edit: You will need to make sure that when selecting your wheel/tire combo to take into consideration the backspacing and offset of the wheels so it will not rub against suspension components, and to make sure that it isn't hitting the frame or body components. The width of the tire selected and to some degree the height of the tire will also come into play.

It took me a while to understand all of the backspacing and offset information, but I think that I understand it a lot better than I used to. Here is a good link to help understand a little better than my explanation:

https://www.tacomaworld.com/threads/wheel-backspacing-and-offset-info.102992/

 

Very very helpful and I appreciate it.
One last thing. where is it on this site or on the web where a person can readily see or determine the factory offset/backspacing for a given vehicle.
I have a 2016 Tacoma TRD off Road with 16" wheels and am putting on it, 17" wheels off of a FJ cruiser.
So I am naturally concerned about the spacing. I assumed they were the same but some brief reading leads me to believe the Tacoma is +25-30 (I think)
and the FJ was +15 ( I think).
Looking at those charts, it looks like a 15/30 difference would be about 5/8"-3/4" difference that the FJ wheel would stick out more than the stock tacoma's +30.
If this is true, I need to abandon my idea of installing wheel spacers for a better look since I am already spaced out more than stock.
mike

 

You can try this website. I am not really sure where one would find factory wheel offset. If you look at the column under the Rim, the ET is the offset for that particular wheel. Hope this helps you out some. I am sure others can/will chime in with some more solid information.