buying tires

[69CSTDawg]

i have a 69 C-10 thats my daily driver,it has a set of firehawk indy 500s that are 3 years old and fairly worn out,i have long a dirt driveway and the truck has been taken back in the woods a few times and its taken a toll on the Indy 500s

1,im definately not looking to lift a 2wd,but i was wondering if 30s (think the ratio it 255,70,r15 or 265,75,r15) would fit under it without any scrubbing

and

2,what tires would anyone recommend? im looking at the General grabbers or some Maxxis tires