On Sunday, August 5, 2018 at 6:35:08 PM UTC-7, Duster wrote:
I'm assisting a team flying an Arcus-T for next week's Nationals at Uvalde. Do I understand correctly that its cockpit and fuselage are the same as for the Duo Discus XL? If so, then is the rigging for both front and back rudder pedals the same too and is there any history of mechanical problems with cables/rods?

Tracing the roots back to 1974: The Arcus fuselage is based on a Duo XL which was an X/Duo which was a Nimbus 4DL/4D which was a Nimbus 3D which was a Janus Ce which started as a Janus.

Duo, X, XL with all -T variants are the most common generation of this family.
From the Duo manual.
__________________________________________________ ______

3. Inspections
Remark:
To ensure the airworthiness of the sailplane the following inspections and
maintenance should be conducted according
- section 3, 4 and 9 of the Maintenance Manual

3.1 Prescribed inspections of the airframe
• Rudder cables
Every 200 flying hours and at every annual survey, the rudder cables are
to be inspected wherever accessible (see FAA AC 43.13-1A § 198) and
the point where they feed through the S-shaped guides to the pedals,
particularly with the pedals in their extreme positions. If the cables are
damaged, worn or corroded, they must be replaced. It is permissible for
individual strands of the cables to be worn up to 25 %.
__________________________________________________ ______

These are not the only gliders or manufacturer to have prescribed inspections for rudder cables beyond the Annual.
A cool thing about the way Schempp and others hook up the two sets of rudder pedals is that if a cable breaks at an S-Tube, the other seat has rudder authority albeit with a return spring to overcome on one side.

Inspect and you'll be comfortable.
Don't scrape the belly pulling it out of the trailer.
And watch Dave Nadler's video on Arcus assembly.
Jim