18" rims

I have a new set of 18" denali rims and i need to order new tires but im not sure what size to get..... i was thinking 295/65/18 but im not sure what would be best. Im purchasing the cognito leving kit and want to put the biggest tire possible but with no issues of rubbing and whatnot. :thumb

I just ordered a set 18" rims off a 2011 gmc 2500 denali, i want to put a 35" tires on it and put them on my truck with out doing major lifting. maybe just turning up the stock keys if possible. Any input?:help