Best advice anyone can give you Jam is to search the web and find a truck to copy because its all been done before .
I don't know but i am inclined to think a 2" lift on the LJ70 will allow for 285'/75's on 16x8 minus 30ish offset rims , which for me begs the question will 16x10 zero offset with a 305 tyre fit ?
It doesn't look to me like you have a lift which makes all the difference .
How about telling us a bit more about yourself and your truck , are you just buying bigger tyres because you need new ones anyway or might this be the first step towards a highly modified truck ?
I just wanted bigger tyres and 4/5 years later i'm still here and still modifying