Here's one of the other unique installations that I've done. I haven't seen anyone else do a table like this, but for the two of us that are typically in the van it's been super convenient. As anyone with a 144 knows, space is at a premium and we figured out that putting the table here checked all the boxes. It's very easy to put up and take down. It's very functional for eating, playing cards, reading etc. Why have the swivel seats if they can't be fully used.

Table is mounted in three places. Two dash mounts and then the leg that is secured into the L-track in the floor.

Here are the dash mounts.

The two brass studs are mounted into an Al block that I installed into the structure within the dash. Unfortunately I was unable to find a suitable metal structure within the dash, but did find a substantial bunch of plastic structure there to mount into.

The circled bolt is where the brass studs mount. As can be seen in the earlier shot, the studs come out between two of the plastic trim pieces.
The table has two connectors that connect to these brass studs. The connectors are furniture cams similar to these:

With a knurled knob to tighten and loosen them.