Are your Good Year tires new?
My Good Year tires are over a year old and they still have a rubber smell when the sun is on them. When they were brand new the smell was quite strong.
Bobby,
Probably that smell came from some other location than your RV... but if you have not yet looked... always a good idea to KNOW it wasn't from yours.
Did you look at both sides of the tires? Looking for any place where they may be rubbing against anything? Just to be sure... I'm not trying to frighten you but just to have a look...