I had the same problem with my 04 T/D Triton - in the end, the only 15" rims I could find that would fit, were for solid front end offset - same as Hilux / Poootrol / Landcruiser...........
Ended up going 15 x 8, with 31 x 10.5R15 STT's. Was no rubbing, even on full flex.
Not the ideal option, but was only way it was gonna work.........
Tip # 1 - Avoid stress & grief & low resale values with vehicles - do it once - do it right, buy a HILUX!!