I've recently come across this excellent site whilst researching RLH vehicle histories, so thought you might be interested to see that the most recent owner of RLH3 posted (back in 2018) some early history of RLH3's time in the US - see https://www.facebook.com/theaterofeden/photos/194327634586212

After 09/1973, the vehicle history is a little vague (you have to go through the other facebook pages to work it out), but it seems from the most recent posting it was still with this owner (The Green Line/Theater Of Eden) in 06/2021.

Kind regards
Paul.

Many thanks for sharing this page, I'll have a read through. I could not reply to you direct as there was no email address given.