I needed a small antenna tuner for use with my portable emergency radio station. You never know what antenna supports will be available, and what conditions might arise; it's better to have the ability to tune anything. After much research and empirical experimentation, I decided that the basic "TEE" match was best for my needs. It is quite versatile and can match almost anything.
The variable capacitors are polyvaricons that I salvaged from old transistor AM radios. The coil was 45 turns on a 1" dia. 1" plastic pipe. I tapped the coil in 12 places to attach to a small rotary switch.
My version contains a "N7VE"-style SWR bridge as well so I don't need a separate SWR bridge to tell me when I'm properly tuned. Another advantage to this type of SWR bridge is that it presents a nearly 50 ohm impedance to the transmitter regardless of the impedance of the attached antenna; protecting the transmitter from excessive SWR while tuning. Once the antenna is properly adjusted, the bridge is bypassed.
To help its "Rugged-ness", I painted the chassis with "Plasti-Dip" rubberized coating rather than paint. First, aluminum is notoriously tough to paint. The quick oxidation layer it forms prevents most paints from adhering. Then, having a literal rubber cover takes some small amount of shock out of dropping the tuner; hopefully making ti a bit more rugged.