Like so many of the, at least Roadtrek, folks, we have fought with the obstinate TV mount that seems to want to move around whenever it feels like it. It seems to always be drooped, in the aisle or whatever at the end of a drive, especially if it is rough.
The first arm clamps to the cabinet, so it is fine, the second arm can't be held tight enough to keep it from swinging out, at least with the tension screws. The tilt adjuster is totally unable to keep the TV vertical. We have been using about a million velcro straps to hold it.
Looking at the OnniMount that Roadtrek supplies (expensive mount) I found that the tilt tightening area comes up tight against internal stops, making it impossible to clamp the tilt mechanism tight enough to prevent droop. I assume it is to prevent the aluminum casting from breaking by overtightening.
I had looked at other mounts for a long time, and was almost ready to build my own, when I ran across one that had a manual clamp for the tilt. The rest of the mount was pretty standard construction. Here is a pic of the mount in the extended position. It is nearly identical to the original in dimensions, so it mounts similarly and extends the same way into the aisle for front viewing.
Detail of the tilt clamp. Simple handle.
This mount used a rod, with 6mm tapped holes on each end, for the second arm pivot. I replaced one of the 6mm clamp screws with a bicycle seatpost quick release bolt of the same thread, so now it can be clamped tighter and released to move it easily.
I moved the clamp handle that Roadtrek supplied to above the top leg of the first arm, as it didn't hit the new mount, and I wanted easy access.
Velcro was added by putting non adhesive straps under the mount so the would hold tight.
Now you just push the TV tight in until it hits the mount (padded) on the aisle side, and the wall above the window on the other side. Attach the velcro to the aisle side while holding the TV in place.
You then clamp the toggle clamp by reaching in, and then hold the main arm with the handle clamp, which you turn CCW to tighten because of the angle the arm is at. When you tighten the two clamps it pulls everything tighter against the velcro, so the TV gets very stable.
What it looks like ready to move into place.
With the handle clamped
Done and ready to travel
We have driven it around here for some miles and it seemed to hold well. We will see how it does on longer, rougher, rides.