i am about to level my silverado by cranking the torsion keys up. im going to put new shocks on and was wondering if i should get the stock size and extenders or should i go with the 1-2.5 inch longer ones? also, will 285-75 tires fit on my chevy 2500hd?

 

I wouldn't mess with shock extensions IMO. Get bilstein 5100s. Best shock if you ask me. And yeah you'll fit those easy.