I just bought a Sport S Wrangler and I thought it would come with a trailer hitch receiver on the back. I thought all Jeep Wranglers had that, but they don't and mine don't (I know, the correct verb is doesn't). So I see there are aftermarket receiver hitches that I can buy for around $100 complete with the wiring. Is it safe to add one of those and tow up to the vehicle weight limits? It looks pretty simple. Can a rookie add it pretty safely or should I pay a mechanic or the dealer to do it? Or is the add on hitch idea crazy?