Right now I have a '95 F150 ext cab long bed,stock height.
I'm running as of now a 18x8.5 wheel ,+20 offset on 255/55-18 tire with dimensions of 29" diameter,10.4" sidewall width,and 8.5" treadwidth.

I want to with a 15" wheel with 0 to -44 offset readings.

15x7 has -6 offset/3 1/2" backspace
15x8 has -19 offset/3 3/4" backspace
15x10 has -44 offset/3 3/4" backspace
15x12 has -63 offset/4" backspace

First two sizes (7 and 8 width) going on front,last two (10 and 12) on rear. Tire diameter height will be 26" all around.

Any thought opinions are welcome.

Oh,I also want to do a 5/6 drop on the truck as well.