hey guys....ive been creeping around the site for close to a year now learning as much as i can about this truck i have now that is an absolute beast i must say....with that being said I want to do some sort of lift with some more aggressive tires. I have a 2010 XE CC. I wanted to ditch the stock crap tires and put on some new 18" XD monsters and some 33'' trail grapplers. first question i have is will this fit without the PWM? I dont mind doing it if needed but id rather not. second question is am i going to get killed on MPG if i go to the 4'' spindle and 2'' blocks in the back with the same rim/tire combo? and lastly i had a guy recommend going down to a 17'' rim....is there any bonus or downside to doing this? thanks for all help ahead of time