Sag and Tilt: rear of 82' 300TD - questions

[Goldenvoice]

1982 300TD Wagon - Ava. 345k miles.

I'm fishing for thoughts about the SLS. Right now, I'm convinced she's in need of a new pair of Accumulators - rides like "a boat in the water". We haul sound equipment a majority of the time, and winding roads are a nightmare - 2 years ago she drove nice...

Anyway, Ava has sagged on the drivers side since we brought her home 3 or 4 years ago - our mechanic, when asked about it, stated it needed new accumulators.

NOW it's obvious it needs new ones, as the handling has definitely deteriorated over the last couple years.

***AND the ride height is low - I can see much too much camber in the rear - tires wearing off on the inside!!!!!!!!!!!!!

BUT, I'm wondering if bad accumulators could make it sag/tilt to one side? Is 'maybe' the one on the drivers side 'worse' than the other?

:/

THOUGHTS: if my understanding of the system is correct, as I attempt to visualize it in motion: if the diaphragms in the accumulators burst, the ride will be hard; but if much, but not all the nitrogen gas has 'dissipated', then the ride gets softer... (?) I've been thinking on this one a while, and that's the only thing I can come up with... OK, I'm rambling...

So, I rebuilt the SLS valve last year - solved the overnight sag. (thanks Andrew!)

***What I'm wondering, as I'm readying to order parts this afternoon, is should I be assuming a new pair of springs for the rear are in order???

...and is changing the springs likely to end up costing much more - ?say, I (or a paid mechanic) busted a fitting off one of the actuators??? Is this likely to happen???

Oh, and, since I want to flush the SLS system, how many Liters of febi fluid should I order (yes, along with a new filter