It is easy to remove the Lagun table mount leaving behind a flush bracket. I doubt I will ever entirely remove the table. I just push it back over the seat and out of the way.
So far I have kept the original Northstar table top which 18"x36". The original table top is made of dense press board. I would say it is as heavy as a brick but that is a gross understatement. It is as heavy as a couple of bricks.
I did find at least two similar systems. Neither appeared to be cheaper, as sturdy, or as adjustable. The Lagun has 3 adjustments. The one mentioned above has two adjustments and definitely looks flimsy by comparison. The Lagun is not cheap, but very sturdy. It is also designed to be used outside in a marine environment.
Regarding the suppliers: The Lagun is a Swedish product so perhaps there is a way to order from Sweden. The price from Marine Teak was really good and the delivery was less than 48 hours from the time I placed my order until delivery. I suppose I could have checked with Northstar but I have had no issues in the past with overseas orders. I also found a US-based RV supply company I was not familiar with so I did not want to order from them.