My truck has P265/70R17 tires will I be able to put LT285/70R17 tires on my stock rims? And will these tires rub at all after i do a 2 inch torsion key lift in the front end?

it wont rub if you have it leveled and 285's will fit fine on stockers

it wont rub if you have it leveled and 285's will fit fine on stockers

2nd that

even if it's a half ton will it still not rub? and i do have the leveling kit but it will also have a plow that might drop the front end an inch with the plow in the raised position, will i still be ok?

don't know about the 1/2 ton thing. I plow in my 3/4 ton duramax crew cab with a 9ft blade on 285 75 r16 mud terrains with stock PYO wheels.