backspacing and offset with a six inch lift
#1
#2
4.5" of backspacing...here it is on my truck when it had a 6" lift 20x10 moto metals on 35x12.5x20...i think this is the stance you are looking for
#5
A 10 inch wide wheel with 4.5 inches of BS sticks out 3.5 inches farther than your OEM wheels. A common wheel spec is also a 9 inch wide wheel with 5 inches of BS (will stick out 2 inches farther than stock) and a 9 inch wide wheel with 4.5 inches of BS (will stick out 2.5 inches farther than stock).