It's simple. You can't pass on the right if there isn't a lane for it. You can't cross the fog line to pass on the right either like a lot of people do on two lane roads. Unless you were going into the left hand turn lane to swing wide to make your right turn, I can't see how the other driver isn't at fault. That's just my professional opinion as I just retired working as a police officer for 22 years investigating a lot of accidents.
I get as far to the left in my lane while making a turn pulling the 5th wheel. And, take your time, everyone else behind can wait and if they don't want to, the bigger vehicle usually wins.
