Jim, I've used 32x11.5s and 31x10.5s on stock rims with my Raider. The 32s were a little close to the frame when the rear axle articulated. Both sizes rub the pitman arm and sway bar. I've used 15x8 and 15x10 wheels with 4" BS and 33x12.5s with no chassis contact. My front bumper ends and front wheel well splash guards are cut out to run the 33s, but no other mods. The 33s made no rear wheel well contact when flexed.

Flexed with 33s (8" front rims, 10" rears):
[Linked Image]

Russell

1987 Raider - Roxy
1988 Mighty Max 2.6L Turbo - Pearl
1997 Mountaineer V8 - Freddy
2000 Excursion V10 - Freya