TOY: Wheel Backspacing

[langehen@xxxxxxxxxxxxxxxxxxxxxxxxx (Lance Langehennig)]

What backspacing are stock toyota 7" wheels? You know, the silver wheel you 
see everywhere.
I haven't taken one off and measured it, and I just got the urge to look 
into 6.5" wide wheels for 32x9.50 swampers. BTW Q78-15 swampers call for 
the that width wheel, SO this could be the only wheel purchase for the toy 
that I make. I'd like to get it right the first time. :) I'm thinking that 
I'd go with 1" less backspacing than the factory wheel. What are ya'lls 
recommendations? I know several people run these (and the 34x9.50 swampers) 
tires.
Thanks,
Lance L.
BTW, it's an 87 4 runner