I am looking for a 4th gen T4R and would like to know what is involved in putting a receiver on a vehicle that does not already come with a receiver? What do I need besides the receiver? Are 4Runners with a receivers equipped differently? I would also like to know if adding a roof rack to a 4Runner that does not have one is a big deal? The parts could be aftermarket or Toyoda stock. Factory or aftermarket would be determined by performance, availability, price and difficulty in installation.