Thank you much Kulch !!!
On a side note ... I keep reading that this thing has issues when attached to the XR5 because of the shifting center of gravity ... I haven't had a problem with it at all so far ... but then, I am attaching it to the XR5's standard payload bay (no need to have to use a Universal Cargo Deck ... which is a great addon in it's own right) ... which doesn't do any shifting that I can tell ...
:blink:
If you are talking about the XR5's center-of-gravity shifting, that only occurs (automatically) during atmospheric flight with the Attitude Hold autopilot engaged, so it should not have any effect on the RMS arm unless you plan to use it during atmospheric flight with Attitude Hold engaged.

(Also, I have no idea how the XR5's CoG shifting could have any effect on the RMS add-on at all.)
In any case, you can easily prevent the XR5's center-of-gravity shifting entirely by editing your
Config\XR5VaguardPrefs.cfg fie and setting
APUAutostartForCOGShift=0:
Code:
#--------------------------------------------------------------------------
# Enable autostart of the APU when the ship's autopilot or automated flight
# control systems need to shift the ship's center of gravity (this is necessary
# during reentry and on landing approach in an atmosphere). If you are an
# experienced pilot and want to always manage the APU yourself, set this to
# option to 0 (disabled).
#
# The default value is 1 (APU auto-startup ENABLED)
#
# 0 = APU auto-startup for COG-shift disabled
# 1 = APU auto-startup for COG-shift enabled
#--------------------------------------------------------------------------
APUAutostartForCOGShift=0
With that change, you can engage the Attitude Hold autopilot and CoG shifting will not occur
unless you manually turn on the APU. So all you have to do is leave the APU off and CoG shifting will not occur while Attitude Hold is engaged. Or you could even leave
APUAutostartForCOGShift enabled and simply turn the APU
off while Attitude Hold is engaged. You will hear a warning callout in that case, but further CoG shifting would not occur.
Be advised, however, that it consumes much more RCS fuel to hold attitude in an atmosphere with CoG shifting offline.