Thats a long haul, your X can do it, but you will get terrible gas milage. If its a trailer make sure that the weight is above the axle. You dont want to put to much weight on the tongue if you can and go slow with it, but like everyone said the further forward the weight the better the handling. If you do not have air helper bags expect your leafs to take a full beating and after a full trip across country depending on how old they are they might be flat. To alleviate some of that try and take it off the hitch at night when you are not using it to directly tow.
I towed my 23' jetboat for about a year and a half in Miami, and towed across country my wifes car once and a 12' uhaul another time. My leafs were flat after the first time across country. I have yet to tow again with the new suspension, that was all stock.