If I thought it was hard to uninstall, I wouldn't have installed it in the first place.

AFAIK, the only directory RTR touches is the Data directory. All you have to do is back up your RTW Data directory before installing RTR. Then you should be able to swap between RTR and RTW just by renaming its directory to "Data" and the other one to something else.

I"m pretty sure that's all you need to do, but check the documentation on the RTR website.