I just did the IFS hub swap on my HJ61. It gave me about 1.25" added width on each side. It was a PITA but I like the system better for a couple of reasons.
It looks stock, and there does not appear to be a spacer on the rim. Because of the local law enforcment this is a big bonus for me. It also mimicks a factory toyota set up. This would tell me that the wheel bearings and hub would be designed to have the tire further out without many ill effects. And generally I think it is a marginally safer then a traditional bolt on spacer. I used lock tight on the bolts and if they do come loose, I lose a rotor, not my tire.
Over all I am very happy with the end result.
Oh, and I did it to gain a little more stability, it wasn't a tire or rim issue. I just needed the wider stance
Oh, and I know guys that use bolt on spacers on their IFS trucks, so I guess that would be an option if you wanted to go even wider then the IFS offset.......