i drive a dodge now, and am looking to buy a 03-05 4 door Z71 when i find one i like in my price range. so heres my questions

Im going to install a 6in lift on 35s. more than likely procomp or fabtech. when installing, am i going to have to cut and weld on my crossmembers or any other components? i know alot of lifts are direct bolt up, but im hearin rumors of under carriage surgury. am i going to have to get into this?

and when it comes to rims, im guessing i have to get new offset rims. is this correct? and if so, what offset do i need? tires will beeither 35x12.50r17s or 18s or the 315/forget width number/17or18

thanks for the info all