hi jimry i did this two days ago,same 08 vehicle.at the rear end of the side rails there are plastic covers lever these up,they are held in place by two sping clips inside along the centre line.when these are off you will find a rubber stop in the end of the rail,take these out then lift the release lever on the cross rail and slide out.lifting one lever releases both locking buttons so can be done from one side single handed.i think it looks much better without the cross rails. hope this helps. brian
I did say the Kia worldwide forum had lots of info on there, here are 4 threads dedicated to the task in hand, the 1st one gives a blow by blow account of exactly what to do & also there is a pdf you can print out if necessary. Not sure how you couldn't find this, all I did was a simple search!