Volkeman, FYI - the Eurochair is a free standing recliner. No seat belt. No bolting to floor. Not a vehicle seat. It has a round wooden base with a metal base ring that it pivots on.

Wow. Sorry, had no idea.

Like this?

Thats 'only' 50 pounds... using this calculator (
https://www.omnicalculator.com/physics/car-crash-force) a 50 pound chair at 60 mph will impart .. 45,000+ ft/lb's of force, or the equivalent of being hit by a 22 TON object. (chart at bottom, cant put them inline here)
So there is a free standing full size chair with attached base that is totally unsecured during over the road travel?!?!?

Surely there must be some way it fastens down for travel... PLEASE.
I am sure to load all in our interior items so in case of 'sudden stop' they are not going to impact the operator/passenger.
I have Mrs V clear the counter before road travel, and I really am uneasy about the corian plugs on the stove and sink even...but I am sorta comforted by the high back seats giving protection and their (relative) low mass. When it was there, the table was always stored for travel. NO if/ands or buts about it. Suitcases and boxes stacked on the couch are held on by straps crisscrossing and fastened to the slider. They have shifted due to some 'avoidance maneuvers' during road trips, but never broken free. I count on the wall structure of the retracted slider to keep them in place should more violent moves happen.
NO way I am gonna have my loverly lady with an unsecured recliner behind her. Are people here with the Eurochair comfortable with it being 'free flying' in case of accident? Or,
as I sincerely hope, there is actually a way to secure it safely during travel and only we safety nerds bother using it? Please say that is the case.
Or is this just something that guys that worked towing and recovery worry about? I have seen more than my share of gory accidents, and SO often it is unsecured loads that injure. A carpenters van after a severe rollover?/ tree impact still has pictures burned into my brain 15 years later.. He and his helper were forced off the side by a merging truck that did not see them. The tools that he worked with were the cause of his death when they flew around the interior. Had he gotten the 'proper' tool shelves and divider for the front compartment, that ~$1500 would have possibly saved his life.
They were both belted in, and the cockpit was intact. There was no question the flying tools had done them in, the cargo and operators were both a big mess in the cockpit when we recovered the van so EMT's could gain access.
Maybe I am overcautious. I probably am, exposure to death and violent crashes will do that. But if they truly put a recliner on a base that is totally unsecured, expect people to operate on the highways like that, and people have no regard for the danger... well there is no shortage of people I guess.

But not on MY watch.