You said you smelled something "electrical hot." Hot brakes have a distinctive smell all their own, not electrical at all.
So were you smelling something electrical, or were you smelling hot brakes?
The biggest mistake was just glancing in the rearview looking for smoke and continuing on, rather than pulling over immediately to find the source of the hot smell. You may simply never know what happened at this point, or it could rear its ugly head at the worst possible moment.
Did you have the RV repair look for the issue? If they could not find it, likely it was no longer there to be found. You will have to wait until it happens again, if it ever happens again.