I've got a set of Rock Warriors sitting around that I really contemplated running as all my other cruisers are running 17s and tires are more abundant. With that said I'm stuck on the BBS Pros (I think they are +56 offset) so here we are. I'll be running SPC UCA's, KDSS relocation kit from Trail Tailor and have the ability to trim/cab mount chop etc if needed I reckon.so mine are technically 34.5 x 12.4 i think. If you use adjustable UCA's to move the axle forward, relocate the kdss bracket and go after the wheel well, it should fit. If you need anymore detail than that, let me know. Im on Rock warriors which I believe offhand are +50 offset, not sure what the Tundras are.
Did you go with 315/70r17s? The closest to that in an 18" wheel looks to be the 295/70r18s.