Tire size 2007 factory wheels
 

Sorry if this is a dumb question or one that has already been answered.

What is the largest tire size I can put on factory wheels on a 2007 1500 with a 3/2 leveling lift? Thanks.

Depending on the rims your using and depending on the offset of those rims will determine the maximum size tire.
My suggestion would be to go to a tire shop. Ask him the same question. A good tire shop will work with you to find that perfect tire, and will advise you on some of the different scenario to watch out for. ei Hard, heavy turns and heavy loads.
If that tire shop won't help you? LEAVE. Go to the next one, until you find one that will help you. Then go back to the first tire shop to show off your new tires :)