If i put bigger rims on my car will that somehow screw up something with the car?

I have a 2002 Ford Explore XLT V6 engine. It currently has the original 15' rims but i wanted to upgrade them to a 24' chrome. I been told that it will screw up the bar that connects them the wheel and after a few months the top of the wheels will move inward and that would screw everything up. Is it true? I know that the speedometer would get messed and i would have to fix that so far.

Driving across the nullarbor?

Hi everyone I'm planing to drive my 1999 ford laser kn lxi hatchback from Torquay victoria to Perth WA and I will be crossing the nullarbor. Could anyone give me some advice? Also would driving in my Laser be a good idea? My friend is coming along so we will take turns in driving. I will not be driving back again. It is an auto and in good condition other then a few stone chip's in the paint everything in it work's and the aircon work's very well.

Any Advice would be great thank you. I have drove it down from queensland to Victoria so i have done some long distance driving before and i was alone at the time.

I will be traveing in January