A bit late, but...I fitted the rear standard duty springs and the RRC still has a O/S lean.
New shocks and ditto angle.
Serious chassis welding - sides and top of lengthwise members replaced from middle cross member to fuel tank. Aforesaid cross member plated over, anti-sway damper re-seated. Rear-spring top brackets strengthened. No tilt improvement.
Body mounts inspected, no problems detected.
New tyres all round, rims checked out...no help here either.
Now the rear lower tailgate will not shut on the O/S, does not close far enough to engage latch on pin, beyond the help of the minor adjustment possible. Though this may be unconnected and due to the rotten back door leaving its hinges, it does seem to be a bit of a suspicious "co-incidence".
I have not done any welding to the back O/S body before or since noticing how bad the lean is, but I did do the N/S/R wheel arch (and surrounding area) plus the side wall/floor behind it, this time last year.
I have become quite worried and, more recently, out of ideas. I mean, its good to do all this maintenance, of course, but its getting in the way of running repairs and definitely putting off the improvements that were planned. Theres not enough :
a) hours in the day
b) life in the shocker, or
c) money in the pocket, for me to continue replacing anything that could possibly be responsible.
I mean, its an RRC. Built in the 80s by British Leyland.... EVERYTHING NEEDS REPLACING.