DH has a hard time with picnic tables, so he wanted a table with standard legs on the four corners and a chair that is not attached. We wanted it to be used inside and outside.
We sleep on the dinette as a bed, so having a place to eat inside has been an ongoing test of tables this year. We could scoot back on the bed and use bed trays, but we usually have to get up in the middle of the meal to get something we forgot, and we both like our feet on the floor when we eat.
My TT has a pretty good open area in front of the couch. Wooden TV trays are too wobbly and a tad too small, the personal size plastic folding tables that are 24" wide are ok, but one is not quite enough and two are too many. I have a roll up camping table from Camping World that goes up easily, is aluminum and we use it as a cooking table outside, but it is a bit too deep, so you can't access the counter or fridge.
I just got a 42" wide folding camping table from Kmart that fits perfectly. It is 24" deep, so I can get around it if needed. It has three heights - 19", 24", and 29." I plan to put it outside with two folding chairs when not using it inside - it is a good size for under the awning.
http://www.kmart.com/northwest-territory-42-in-fold-in-half-adjustable/p-089W320483110001P?prdNo=2&blockNo=2&blockType=G2
They have matching folding chairs, but the weight limit is 225 lbs. I have some folding chairs that are a little more "robust" that are from Ace Hardware. The folding chairs fit in the storage compartment, the table fits under the bed.