My table is 72" x 20" with a 3/4 thinwall EMT frame.
I have a double-rail raft frame, so the table frame is only 54" x 18" to fit inside the frame bay and over my drop bag.
1" EMT for the hinge. I have loop straps to keep the legs splayed, but I plan to rebuild and use a 3/4"-1" sleeve with a pin. The straps stretch slightly and make the table wobbly.
There are small tabs on the inside of the frame that the legs snap into when they fold. Because they meet in the middle, this table is only about 27" high (cocktail/stove) height. It seems low when all the others are ~42" high, but it's easier for short people to wash dishes at this table!!