The design of the Renegade with it's flip-up tailgate limits how you can store things. AVID makes several options, you can even buy a generic rig that inserts in your trailer hitch if you have one. The AVID setups are pricey but you get what you pay for; most require you removing the entire plastic rear fascia and replacing with a metal bumper.
Any change won't be cheap, you have to evaluate how bad you want that extra 5 gallons of gas.
Any change won't be cheap, you have to evaluate how bad you want that extra 5 gallons of gas.