I currently have the F5's in the 17x8.5 variety (4.3" BS) on my 85 4runner. I don't particularly see the need for a 3.5 BS as you can easily add wheel spacers, choose any number of similar wheels in a BS that fits your needs, or add something like the FROR kit to your solid axle like I've chosen to do if you want to widen your track width.
No.