need much more information from lee to comment on whether they are suitable for him. i found they are quite sturdy for the small table on which i used mine. I have not used their folding feature but they seem well designed and made.
Yes they will fit.
No more than 2lbs. Fairly light
I would be careful with leaning on the table etc. It might not hold up to a "spirited" game of ping pong or beer pong. Rick
They are very sturdy and don't wiggle.
It's been a while since I put them on and I no longer have the table, but as I recall I had to offset them so they would fold flat.
Stability would be a problem for a table so wide. They're meant for narrower tables, say 5' x 3'