[JasonB]

Regarding height, bear in mind that a standard dining table is around 72cm tall, and a standard kitchen works surface around 90cm. These are the two heights which you'll find it easier to use if you want to buy in your legs.

When we worked on the J-Trak system, Duncan started with a table height of 90cm, but quickly reverted to the lower 72cm, as it was better for youngsters, people using wheelchairs, or anyone that wanted to sit down. If none of that is an issue then 90 cm is a good height to work at, that's why they make kitchen work surfaces that height.

Most of the portable tracks I've seen use screw in legs, rather than a folding structure, as they are so simple to use, and cheaper to buy.  They usually have a baseplate that you attach to the bottom of your table, then the leg screws into that, and they have adjustable feet to account for uneven floors. If you choose the lower height of table then Adils legs by IKEA are really good value. If you go for the taller height, then you can search for breakfast bar legs. These are generally more expensive, being less common.

Alternatively you could make your own folding structure, but that's obviously a lot more involved.