On flat ground, no problem. If mountain passes are involved, good luck!
I had 1 passenger,2 dirt bikes on a small bike trailer and our gear headed over Snoqualmie Pass (WA State) and it felt like I had a 35' travel trailer behind me.
I also didn't have the wind resistance that you might experience. If you rent a truck, rent a dolly as well so you can pull the Sportage behind you <img src="/forums/images/graemlins/kewl.gif" alt="" />